Waterbury Clock Escapement Stopping Same Tooth Diagnosis Guide

Waterbury clock movements stopping repeatedly at same escape wheel tooth reveal complex diagnostic challenges where apparent single problem - bent escape wheel tooth - often masks multiple underlying issues including inadequate power delivery from too-tight bushing installations, incorrect verge span creating excessive pendulum amplitude requirements, weak mainsprings characteristic of Waterbury economy construction, or improper beat adjustment causing clock stopping at weakest escapement position. Clock appearing mechanically sound with properly bushed pivot holes smooth wheel rotation and adequate endshake may still exhibit persistent stopping where systematic power delivery testing reveals subtle friction points consuming available power faster than Waterbury's characteristically thin 0.014-inch mainsprings can deliver creating marginal operation stopping at slightest additional resistance anywhere throughout train.

Proper diagnosis requires methodical isolation testing each potential problem source rather than assuming obvious suspect like bent tooth explains complete failure where experienced clockmakers recognize stopping at same tooth represents symptom not necessarily cause requiring systematic evaluation of verge span adequacy, pallet drop uniformity, power transmission efficiency throughout complete train, plus proper beat adjustment ensuring clock operates centered in escapement action range. This guide covers understanding why Waterbury movements are particularly sensitive to friction and escapement problems from economy construction using minimal power reserves, performing systematic power delivery testing identifying subtle binding that free-spin tests miss, evaluating verge span adequacy using Steven Conover calculation methods determining proper pallet spacing for specific escape wheel, adjusting pallet drops achieving uniform escape wheel advancement on both tick and tock strokes, plus recognizing that apparently bent escape wheel teeth may be acceptable when proper verge positioning provides adequate clearance making tooth straightening unnecessary when fundamental problems lie elsewhere throughout mechanism.

Understanding Waterbury Movement Characteristics

Why Waterbury Clocks Are Power-Sensitive

Waterbury Clock Company manufactured affordable mass-market clocks during late 1800s and early 1900s using economy construction methods minimizing costs while maintaining acceptable reliability. Critical cost-saving measure was using thinner mainsprings compared to contemporary manufacturers - Waterbury commonly used 0.014-inch thickness mainsprings while competitors typically used 0.018-inch springs. This 22% reduction in spring thickness significantly reduces available power creating movements with minimal power reserves barely adequate for reliable operation when properly adjusted. Therefore, Waterbury movements show exceptional sensitivity to any friction or binding throughout train - problems that more powerful movements easily overcome create complete failure in marginally-powered Waterbury mechanisms.

Additionally, Waterbury used stamped brass components where competitors used turned brass or steel providing better dimensional accuracy and wear resistance. Stamped construction creates slight dimensional variations between individual movements requiring careful individual adjustment rather than standardized setup procedures working reliably across production run. Furthermore, bushings if installed may use older techniques creating tighter fits than modern standards recommend. Clockmaker accustomed to contemporary bushing practices creating modest clearances for smooth operation may unknowingly create too-tight installations in Waterbury movements consuming excessive power through friction preventing reliable operation despite bushings appearing technically correct using normal standards.

Escape wheel tooth quality varies considerably in Waterbury movements. Stamping process creates teeth with dimensional variations plus potential burrs or bends from manufacturing or subsequent damage. However, movements typically ran satisfactorily despite imperfect teeth because original verge positioning provided adequate clearance accommodating irregularities. Problems arise when service work alters verge position moving it closer to escape wheel attempting to maximize locking - practice appropriate for more powerful movements but creating problems in marginally-powered Waterbury mechanisms where minimal verge clearance makes small tooth irregularities create intermittent stopping. Therefore, Waterbury escapement adjustment requires accepting less-than-maximum locking trading theoretical optimization for practical reliability accommodating inevitable tooth imperfections.

Verge Span and Power Requirements

Verge span - distance between pallet tips determining how many escape wheel teeth fall between pallets - critically affects power requirements. General guideline suggests verge should span approximately one-quarter of escape wheel teeth. For 36-tooth escape wheel, this suggests 9 teeth span though practical installations commonly use 7-9 teeth depending on specific movement geometry and available power. Verge spanning fewer teeth - perhaps only 6 teeth - creates situation requiring wider pendulum amplitude achieving same escapement action. Wider amplitude demands more power maintaining pendulum motion against air resistance and bearing friction potentially exceeding available power from thin Waterbury mainspring.

Insufficient verge span also affects lift angles - angles at which escape wheel teeth contact pallets transferring energy to pendulum. Narrow-span verge creates more aggressive lift angles requiring greater power for tooth to successfully push pallet aside releasing wheel. Conversely, proper-span verge creates gentler lift angles enabling escapement action with less power input. Therefore, verge appearing to function adequately may actually be fundamentally inadequate for marginal-power Waterbury movement. Replacing narrow-span verge with proper-span version dramatically improves reliability even when narrow verge seemed to work suggesting problem was elsewhere.

Verge span calculation uses Steven Conover method providing systematic approach determining proper pallet spacing. Count teeth spanned by existing pallets - typically 6 or 7 for Waterbury movements. Add 2 teeth to spanned count creating target span - 6-tooth span becomes 8-tooth target. Measure tip-to-tip distance across target tooth count on escape wheel. Subtract one drop distance (approximately 0.059 inches) from total measurement yielding proper pallet tip-to-tip spacing. Compare calculated spacing against existing verge - significant difference suggests verge replacement may solve persistent stopping problems. However, recognize calculations provide approximations requiring final fitting adjustment achieving proper drops and clearances.

The Role of Proper Beat Adjustment

Beat adjustment - positioning clock so escapement operates centered in its action range - critically affects reliable operation particularly in marginal-power movements. Clock significantly out of beat requires pendulum swinging farther in one direction compared to opposite direction creating unequal tick-tock intervals. Longer swing in one direction demands more power from escapement potentially exceeding available power causing clock stopping preferentially at weakest point in escapement action. Stopping occurs repeatedly at same escape wheel tooth because that tooth happens to contact pallet at moment of weakest pendulum amplitude when clock is out of beat.

Proper beat creates equal-duration tick and tock sounds indicating pendulum swings symmetrically through center position. Achieving proper beat requires either adjusting crutch position on verge arbor or repositioning entire movement relative to vertical achieving level mounting. Waterbury movements typically use simple crutch wire slipping onto verge arbor enabling position adjustment. However, crutch must grip arbor securely - loose crutch slips during operation gradually losing beat adjustment creating progressive reliability degradation. Additionally, crutch wire hoop engaging pendulum leader must center properly - excessive clearance or off-center positioning limits effective pendulum amplitude reducing available escapement energy.

Test beat by listening to tick-tock rhythm. Equal intervals indicate proper beat. Unequal intervals - distinct tick-TOCK or TICK-tock pattern - indicate adjustment needed. Make small crutch position changes testing after each adjustment. However, recognize that achieving perfect beat may be impossible if escapement has other problems - badly worn pallets, incorrect verge span, or inadequate power create situations where no amount of beat adjustment achieves reliable operation. Therefore, beat adjustment represents final adjustment after addressing fundamental mechanical problems rather than first-attempt fix for stopping clock potentially masking serious underlying defects requiring proper correction.

Systematic Power Delivery Testing

Why Free-Spin Tests Are Insufficient

Common diagnostic approach tests individual wheels for free spinning - ability to rotate easily with finger pressure - concluding that freely-spinning wheels indicate adequate power delivery throughout train. However, free-spin testing is fundamentally inadequate for diagnosing marginal power problems. Wheel spinning freely under modest finger pressure may still consume excessive power during actual operation under mainspring drive. Critical difference is that finger testing applies intermittent force at relatively high speed while mainspring applies continuous force at very slow speed. Friction problems invisible during fast finger spinning become apparent during slow continuous mainspring operation consuming power preventing reliable escapement action.

Proper power testing uses low-power roll test observing wheel behavior under minimal mainspring tension. Let down mainspring completely then wind only 2-3 clicks providing barely enough power starting wheel rotation. Observe whether wheels turn smoothly or show hesitation, binding, or complete stopping at specific positions. Wheels should advance smoothly even under minimal power. Hesitation or stopping indicates friction point consuming power. Additionally, continuously stop escape wheel with finger preventing rotation - this loads train maintaining tension throughout revealing friction points that free-coasting test misses. Binding wheel shows resistance to manual rotation or requires excessive force turning compared to adjacent wheels.

Test with movement in multiple orientations - face up, face down, and vertical. Some friction problems appear only in specific orientations where gravity loads pivot differently creating binding. For example, worn or improperly bushed pivot hole may show adequate clearance in one orientation but binding in another where pivot shifts under gravity creating metal-to-metal contact. Additionally, test individual wheel pairs installing only specific wheels checking smooth meshing without other train complications. This isolates problems to specific wheel interactions enabling targeted correction rather than random adjustments throughout movement hoping to stumble upon solution.

Identifying Too-Tight Bushings

Bushing installations creating excessive friction represent common problem particularly when previous clockmaker bushed every pivot hole without discriminating between worn holes requiring bushing and satisfactory holes not needing intervention. Enthusiastic beginner clockmaker sometimes believes comprehensive bushing improves movement reliability when actually over-bushing creates more problems than original worn holes. Additionally, bushing technique may create too-tight fits - proper modern bushing should show modest clearance enabling arbor to rattle slightly when lifted and dropped. Older bushing practices or inexperienced installer may create near-zero-clearance fits consuming power through friction despite technically-correct installation.

Test bushing tightness using drop test. Hold movement with face toward floor. Lift individual wheel using finger under wheel rim raising arbor to top of pivot hole clearance. Release wheel allowing it to drop under own weight. Properly bushed wheel drops immediately creating audible click when arbor contacts lower pivot hole. Too-tight bushing prevents or delays drop - wheel descends slowly or requires manual pushing. Perform test on both front and back plate pivots. Additionally, verify pivot holes are perpendicular to plates - angled holes create binding even with adequate diameter. Test by inserting arbor in hole and tilting plate in four directions - north south east west - observing whether arbor tilts equally in all directions indicating properly centered perpendicular hole.

Correct too-tight bushings by carefully reaming to proper clearance. However, recognize that reaming installed bushings risks creating oversized holes if reamer wanders or cuts unevenly. Better approach removes bushing completely, verifies hole perpendicularity, reinstalls new properly-sized bushing, then reams to final dimension using broach ensuring precise diameter and smooth finish. For valuable or sentimental clocks, this additional work justifies effort ensuring optimal results. For common movements with modest value, pragmatic approach accepts slightly imperfect bushing accepting modest power loss rather than investing extensive time achieving theoretical perfection providing minimal practical benefit.

Escape Wheel Arbor Specific Problems

Escape wheel arbor particularly prone to binding problems because it experiences unique loads compared to other train wheels. Escapement action creates repeated start-stop cycling rather than continuous rotation characteristic of other train wheels. This cycling creates wear patterns potentially causing binding at specific rotational positions. Additionally, escape wheel lantern pinion uses trundles - individual pins forming pinion rather than solid gear - potentially showing bent or worn individual trundles creating uneven power transmission. Single bent trundle creates binding once per escape wheel revolution explaining why clock stops repeatedly at same position rather than randomly throughout escape wheel rotation.

Inspect escape wheel lantern pinion carefully using magnification identifying bent worn or missing trundles. Trundles should show uniform spacing and length. Bent trundle protrudes beyond normal circular envelope creating interference with driving wheel. Worn trundle shows grooves or flat spots from years of mesh contact. Missing trundle creates complete loss of drive at specific position though this rarely occurs except from severe abuse or manufacturing defect. Straighten bent trundles using flat-jaw pliers carefully bending back to proper position. Replace escape wheel if trundle damage is excessive making repair impractical though replacement Waterbury escape wheels are readily available from suppliers or donor movements.

Additionally, verify escape wheel arbor pivots for straightness and proper geometry. Bent pivot creates wobbling escape wheel showing varying clearance to verge throughout rotation. Position where bent pivot brings wheel closest to verge creates catching potentially stopping clock. Test pivot straightness by supporting arbor in lathe or between centers rotating slowly observing for visible runout. Straighten bent pivot using careful pressure in pivot straightening tool or improvised fixture. However, recognize that straightening hardened steel pivots risks creating fractures requiring complete arbor replacement. Therefore, attempt straightening only when replacement parts are available as backup if straightening fails creating worse problem than original bent condition.

Verge and Pallet Adjustment

Evaluating Pallet Drop Uniformity

Proper recoil escapement operation requires equal drops off both entrance and exit pallets. Drop represents escape wheel rotation occurring after tooth clears pallet before opposite tooth contacts opposite pallet - essentially free rotation between pallet engagements. Equal drops ensure pendulum receives identical energy impulses on both tick and tock strokes creating smooth consistent timekeeping. Unequal drops indicate improper verge adjustment creating situation where pendulum must work harder during one stroke compared to opposite stroke potentially contributing to stopping problems particularly in marginal-power Waterbury movements.

Test drop equality by slowly moving crutch by hand observing escape wheel motion. Tick stroke should produce identical visible escape wheel rotation compared to tock stroke. However, visual observation is imprecise particularly for small drops characteristic of Waterbury escapements. Better approach marks escape wheel with ink or marker then carefully cycles through multiple tick-tock operations noting whether marked position shows consistent advancement. Unequal drops create progressive position drift where marked position advances farther in one direction creating noticeable pattern after several cycles. Photograph or video escapement action enabling frame-by-frame analysis revealing drop differences difficult observing real-time.

Adjust drops through verge position changes. Moving verge closer to escape wheel reduces exit pallet drop while minimally affecting entrance pallet drop. Conversely, moving verge away increases exit drop. However, these adjustments interact with locking - verge position affects how deeply tooth engages pallet before pendulum reversal releases it. Therefore, drop adjustment requires iterative process balancing drop equality against adequate locking. Target modest locking approximately 1/3 to 1/2 tooth depth rather than maximum possible locking. Modest locking provides adequate security preventing escape wheel slipping past pallet while providing tolerance for escape wheel tooth irregularities that maximum locking makes problematic.

Verge Cock Position Adjustment

Verge cock - brass mounting tab securing verge arbor to movement plate - enables position adjustment through careful bending moving verge closer to or farther from escape wheel. However, adjustment demands delicate technique preventing damage to mounting tab or verge arbor. Excessive force bends tab permanently potentially fracturing mounting rivet creating difficult repair. Additionally, verge cock includes shoulder positioning tab at specific distance from plate - shoulder must seat fully against plate preventing tab flexing during operation. Adjustment must preserve shoulder seating while achieving desired verge position change requiring careful technique.

Adjust verge cock using small punch or brass rod approximately 1/8 inch diameter positioned against tab edge near rivet. Tap gently with lightweight hammer making tiny incremental adjustments. Mark tab outline with fine-point marker before adjusting providing visual reference for movement amount. Tab movement of few thousandths inch significantly affects drop and locking - 0.002-0.003 inch movement may suffice achieving desired adjustment. Therefore, make smallest possible adjustments testing after each change preventing overshoot requiring reverse correction potentially loosening rivet or work-hardening brass creating brittle tab prone to fracture.

Verify verge arbor remains perpendicular to mounting tab after adjustment. Bent arbor creates escape wheel wobbling throughout rotation varying pallet clearance potentially creating intermittent catching. Test perpendicularity by visual observation ensuring arbor appears square to tab in multiple viewing angles. Additionally, ensure tab seats fully against plate after adjustment - unseated shoulder creates excessive verge endshake allowing arbor shifting during operation creating inconsistent escapement action. Some clockmakers add small brass shim between tab and plate achieving desired verge position without bending tab though this approach requires careful shimming preventing excessive endshake creating its own problems.

When to Replace Verge

Sometimes existing verge is fundamentally inadequate regardless of adjustment attempts. Verge spanning insufficient teeth - perhaps only 5-6 teeth instead of proper 7-9 teeth - cannot be corrected through position adjustment. Additionally, pallet angles may be incorrect for specific escape wheel creating poor lift characteristics or inadequate locking. Worn pallets showing deep grooves from years of operation may be beyond economical repair requiring replacement. Calculate proper verge specifications using Steven Conover method comparing against existing verge dimensions. Significant discrepancy suggests replacement rather than adjustment provides proper solution.

Replacement verges are readily available from supply houses or salvaged from donor movements. Timesavers and other suppliers offer verges sized for specific tooth counts and escape wheel diameters. Measure existing verge noting pallet spacing, arbor diameter, crutch mounting location, and overall geometry. Order replacement matching these dimensions as closely as available. However, recognize that generic replacement verges require fitting - pallet angles may need adjustment, crutch wire positioning requires modification, and arbor length might need trimming achieving proper fit. Therefore, replacement verge provides starting point requiring skilled fitting rather than drop-in solution working without modification.

Install replacement verge testing operation before finalizing installation. Check drop equality through hand cycling. Verify adequate but not excessive locking. Test under power using few mainspring clicks confirming smooth reliable operation. Make necessary adjustments to verge cock position plus pallet spacing if needed. Some clockmakers carefully stone pallet faces adjusting angles achieving optimal drops and locking. However, this requires experience and proper technique - aggressive stoning ruins pallets requiring another replacement. Therefore, conservative approach makes minimal modifications accepting slight imperfection rather than aggressive "improvements" potentially creating worse problems than original verge despite its inadequacies.

FAQs

Why does my Waterbury clock stop at the same escape wheel tooth?

Waterbury clock stopping at same escape wheel tooth indicates that specific tooth encounters pallet at moment of weakest escapement action where marginal power delivery from characteristically thin 0.014-inch Waterbury mainsprings cannot overcome friction throughout train plus escapement demands at that specific position. Clock may be significantly out of beat creating unequal pendulum swing where longer swing in one direction demands excessive power stopping clock preferentially when that specific tooth contacts pallet during weak swing direction. Additionally tooth may have slight bend or irregularity creating interference with pallet where proper verge positioning providing adequate clearance would allow tooth to pass without catching. However stopping at same tooth represents symptom not necessarily cause requiring systematic evaluation of complete power delivery throughout train, verge span adequacy ensuring pallets span proper number of teeth approximately one-quarter of total escape wheel teeth, pallet drop uniformity achieving equal escape wheel advancement on both tick and tock strokes, plus proper beat adjustment ensuring clock operates centered in escapement action range. Test power delivery using low-power roll test winding only 2-3 mainspring clicks observing whether wheels turn smoothly or show hesitation indicating friction consuming power. Additionally verify bushings aren't too tight by performing drop test where properly bushed wheel drops immediately under own weight when lifted and released.

How do I know if my Waterbury verge spans enough teeth?

Know if Waterbury verge spans enough teeth by using Steven Conover calculation method where you count teeth spanned by existing pallets typically 6 or 7 for Waterbury movements then add 2 teeth creating target span making 6-tooth span become 8-tooth target. Measure tip-to-tip distance across target tooth count on escape wheel then subtract one drop distance approximately 0.059 inches from total measurement yielding proper pallet tip-to-tip spacing. Compare calculated spacing against existing verge measurement where significant difference indicates verge replacement may solve persistent stopping problems. General guideline suggests verge should span approximately one-quarter of escape wheel teeth where 36-tooth escape wheel suggests 9 teeth span though practical installations commonly use 7-9 teeth depending on specific movement geometry and available power. Verge spanning fewer teeth perhaps only 6 teeth creates situation requiring wider pendulum amplitude achieving same escapement action where wider amplitude demands more power potentially exceeding available power from thin Waterbury mainspring. Additionally insufficient verge span affects lift angles creating more aggressive angles requiring greater power for tooth to successfully push pallet aside releasing wheel. Replacement verges are available from suppliers like Timesavers offering verges sized for specific tooth counts though generic replacements require fitting where pallet angles may need adjustment and arbor length might need trimming achieving proper fit.

What is the low-power roll test and why is it important?

Low-power roll test observes wheel behavior under minimal mainspring tension identifying friction points that free-spin testing misses where you let down mainspring completely then wind only 2-3 clicks providing barely enough power starting wheel rotation. Observe whether wheels turn smoothly or show hesitation binding or complete stopping at specific positions where wheels should advance smoothly even under minimal power and hesitation indicates friction point consuming power. Additionally continuously stop escape wheel with finger preventing rotation which loads train maintaining tension throughout revealing friction points that free-coasting test misses. Test is important because free-spin testing applies intermittent force at relatively high speed while mainspring applies continuous force at very slow speed where friction problems invisible during fast finger spinning become apparent during slow continuous mainspring operation consuming power preventing reliable escapement action. Perform test with movement in multiple orientations including face up face down and vertical because some friction problems appear only in specific orientations where gravity loads pivot differently creating binding. Wheel spinning freely under modest finger pressure may still consume excessive power during actual operation under mainspring drive making free-spin conclusion about adequate power delivery fundamentally inadequate for diagnosing marginal power problems characteristic of Waterbury movements using thin 0.014-inch mainsprings.

How do I adjust Waterbury verge cock position safely?

Adjust Waterbury verge cock position safely using small punch or brass rod approximately 1/8 inch diameter positioned against tab edge near rivet tapping gently with lightweight hammer making tiny incremental adjustments. Mark tab outline with fine-point marker before adjusting providing visual reference for movement amount where tab movement of few thousandths inch significantly affects drop and locking making 0.002-0.003 inch movement potentially sufficient. Make smallest possible adjustments testing after each change preventing overshoot requiring reverse correction potentially loosening rivet or work-hardening brass creating brittle tab prone to fracture. Adjustment demands delicate technique preventing damage to mounting tab or verge arbor where excessive force bends tab permanently potentially fracturing mounting rivet creating difficult repair. Verge cock includes shoulder positioning tab at specific distance from plate where shoulder must seat fully against plate preventing tab flexing during operation requiring adjustment preserving shoulder seating while achieving desired verge position change. Verify verge arbor remains perpendicular to mounting tab after adjustment because bent arbor creates escape wheel wobbling throughout rotation varying pallet clearance potentially creating intermittent catching. Additionally ensure tab seats fully against plate after adjustment where unseated shoulder creates excessive verge endshake allowing arbor shifting during operation creating inconsistent escapement action affecting reliability.

Why are Waterbury movements so sensitive to friction problems?

Waterbury movements are sensitive to friction problems because economy construction used thinner mainsprings compared to contemporary manufacturers where Waterbury commonly used 0.014-inch thickness mainsprings while competitors typically used 0.018-inch springs. This 22% reduction in spring thickness significantly reduces available power creating movements with minimal power reserves barely adequate for reliable operation when properly adjusted making any friction or binding throughout train create complete failure where more powerful movements easily overcome same problems. Additionally Waterbury used stamped brass components instead of turned brass or steel providing better dimensional accuracy and wear resistance where stamped construction creates slight dimensional variations between individual movements requiring careful individual adjustment rather than standardized setup procedures. Escape wheel tooth quality varies considerably where stamping process creates teeth with dimensional variations plus potential burrs or bends from manufacturing though movements typically ran satisfactorily despite imperfect teeth because original verge positioning provided adequate clearance accommodating irregularities. Problems arise when service work alters verge position moving it closer to escape wheel attempting to maximize locking creating situation where minimal verge clearance makes small tooth irregularities create intermittent stopping. Therefore Waterbury escapement adjustment requires accepting less-than-maximum locking trading theoretical optimization for practical reliability accommodating inevitable tooth imperfections plus ensuring all bushings provide adequate clearance and all pivots are smooth and straight minimizing friction throughout train.

Should I straighten bent escape wheel teeth?

Maybe straighten bent escape wheel teeth depending on whether proper verge positioning provides adequate clearance accommodating irregularities where teeth appearing slightly bent or irregular may be acceptable when verge positioned properly rather than pushed close to escape wheel attempting maximum locking. Test by adjusting verge cock moving verge slightly away from escape wheel providing additional clearance then operating clock observing whether stopping problems disappear. If increased clearance solves stopping then tooth irregularities are acceptable requiring only proper verge adjustment rather than tooth straightening. However if specific tooth shows severe bend creating obvious interference visible under magnification then careful straightening using flat-jaw pliers may improve operation. Use magnification observing tooth position relative to adjacent teeth where bent tooth shows distinct protrusion or deviation from circular pattern. Make small careful bending adjustments using pliers supporting tooth base preventing excessive force that might fracture tooth or damage wheel. However recognize that escape wheel replacement may be more reliable solution than attempting to perfect badly damaged teeth where replacement Waterbury escape wheels are readily available from suppliers or salvaged from donor movements providing known-good starting point. Additionally polish escape wheel removing any burrs or rough spots from stamping process using fine abrasive paper or buffing compound creating smooth tooth surfaces reducing friction during pallet engagement improving overall escapement smoothness even with slight tooth irregularities remaining.

What role does beat adjustment play in stopping problems?

Beat adjustment critically affects reliable operation particularly in marginal-power Waterbury movements where clock significantly out of beat requires pendulum swinging farther in one direction compared to opposite direction creating unequal tick-tock intervals. Longer swing in one direction demands more power from escapement potentially exceeding available power causing clock stopping preferentially at weakest point in escapement action where stopping occurs repeatedly at same escape wheel tooth because that tooth happens to contact pallet at moment of weakest pendulum amplitude when clock is out of beat. Proper beat creates equal-duration tick and tock sounds indicating pendulum swings symmetrically through center position achieved by adjusting crutch position on verge arbor or repositioning entire movement relative to vertical achieving level mounting. Test beat by listening to tick-tock rhythm where equal intervals indicate proper beat and unequal intervals showing distinct tick-TOCK or TICK-tock pattern indicate adjustment needed. Make small crutch position changes testing after each adjustment though recognize that achieving perfect beat may be impossible if escapement has other problems including badly worn pallets incorrect verge span or inadequate power. Therefore beat adjustment represents final adjustment after addressing fundamental mechanical problems rather than first-attempt fix for stopping clock potentially masking serious underlying defects. Additionally crutch wire hoop engaging pendulum leader must center properly where excessive clearance or off-center positioning limits effective pendulum amplitude reducing available escapement energy contributing to stopping problems.