Introduction
Mainsprings are one of the most dangerous and misunderstood components in mechanical clock repair. Beginners often underestimate the force stored in a wound spring or use unsafe tools that lead to injuries, bent arbors, or damaged movements. This guide explains the most common mainspring mistakes and how to avoid them.
Improper Let-Down Technique
Letting down a mainspring with only a key
This is one of the most dangerous beginner mistakes. A key offers no control, and if it slips, the spring can unwind violently, causing injury or damaging the movement.
Not wearing gloves during let-down
Springs can cut skin instantly. Gloves provide essential protection when handling wound springs.
Letting the spring unwind too quickly
Beginners often release tension too fast, causing the spring to slam against the barrel or arbor.
Using Unsafe or Improvised Tools
Using loop-end winders or homemade devices
Improvised winders can fail under load, causing the spring to explode outward. Proper mainspring winders are designed to contain the spring safely.
Using pliers to control a spring
Pliers slip easily and can deform the inner coil or arbor hook.
Using screwdrivers as wedges
Beginners sometimes pry springs with screwdrivers, which can slip and cause injury.
Mishandling Springs During Cleaning
Putting two mainsprings in the same container
This almost guarantees they will tangle, scratch, or deform each other. Always clean springs individually.
Letting springs expand uncontrolled in cleaning solution
Springs should be restrained or handled carefully to prevent sudden expansion.
Using harsh chemicals that damage spring surfaces
Strong solvents can remove protective coatings or cause corrosion.
Reassembly and Installation Mistakes
Forgetting to reinstall the mainspring entirely
Beginners sometimes reassemble a movement without the spring, especially when distracted or working on multiple clocks.
Incorrectly hooking the inner coil
If the inner coil is not properly engaged with the arbor hook, the spring will slip under load.
Installing a deformed or set spring
Springs that have taken a permanent set or have distorted coils will not deliver consistent power.
Lubrication Mistakes
Using the wrong lubricant
WD-40 and general-purpose oils gum up and cause drag. Only proper mainspring grease should be used.
Over-lubricating the spring
Too much grease attracts dirt and slows the spring’s expansion.
Not lubricating at all
Dry springs chatter and release power unevenly, causing erratic timekeeping.
Recommended Internal Links
FAQs
What is the most dangerous mainspring mistake?
Letting down a mainspring with only a key is the most dangerous and commonly reported beginner error.
How do I know if a mainspring is safe to reuse?
Check for cracks, distortion, and permanent set. Springs with uneven coils or visible damage should be replaced.
Why does my clock run weak after cleaning?
The mainspring may be dry, improperly lubricated, or installed incorrectly.
Can I clean a mainspring without removing it?
No. In-barrel cleaning is ineffective and can hide cracks or deformation.
Why does my mainspring slip when winding?
The inner coil may not be properly hooked to the arbor, or the spring may be worn.
0 comments