This guide walks through the complete process of cleaning and greasing a mainspring using simple tools and safe techniques. The method shown here is ideal for beginners who do not yet own a mainspring winder. Proper mainspring preparation ensures smooth power delivery, reduces wear on pivots and bushings, and improves the overall performance of the movement.
If you are following along with a full restoration sequence, you may also find it helpful to review related guides such as the Seth Thomas Ogee restoration or the Ingraham 8-Day repair guide.
Materials needed for mainspring cleaning
Kerosene
Kerosene is an effective cleaner for removing old grease, oil, and dirt from mainsprings. Only a small amount is needed. In some regions, kerosene is dyed blue to prevent accidental ingestion, but the color does not affect its cleaning ability.
Scourer pad
A small piece of scourer pad is used to scrub the mainspring. You only need a small section, and it should be dampened—not soaked—with kerosene.
Clean cloths
Several clean cloths are required to remove kerosene residue and dry the spring thoroughly before greasing.
PTFE grease
PTFE-based grease provides long-lasting lubrication and is ideal for mainsprings. It reduces friction and prevents sticking or jerky power delivery.
Plastic storage bag
A labeled plastic bag keeps the cleaned and greased spring protected from dust and contamination until reassembly.
Preparing the workspace
Lay down newspaper or protective paper to prevent kerosene from soaking into your bench. Wearing gloves is recommended, as kerosene can easily get on your hands during the cleaning process.
Cleaning the mainspring
Applying kerosene
Dip the scourer pad into the kerosene and squeeze it to distribute the liquid evenly. You only need enough to dampen the pad.
Wiping the spring
Starting at the outer end of the mainspring, wipe back and forth along the length of the spring. This removes old grease, oil, and accumulated dirt. Continue working your way toward the tighter inner coils.
Avoiding damage
Do not pull the spring outward while cleaning. Excessive force can distort the spring into a cone shape, known as “pyramiding,” which permanently ruins it. Instead, clean as far as you can reach without stressing the metal.
Working back down the spring
Once you reach the tight inner coils, reverse direction and wipe back down the full length of the spring. This ensures even cleaning and removes loosened debris.
Drying the mainspring
First drying pass
Fold a clean cloth and wipe the entire length of the spring to remove kerosene. Work from the outer end toward the inner coils, just as you did during cleaning.
Second drying pass
Use a fresh section of cloth and repeat the process. This ensures all kerosene is removed before applying grease. Any remaining kerosene will dilute the lubricant and reduce its effectiveness.
Greasing the mainspring
Applying PTFE grease
Using a toothpick, begin applying grease to the inside surface of the mainspring. Only one side needs to be greased. When the spring is wound, the grease will naturally transfer to the opposite side, providing full coverage.
Working along the spring
Apply a thin, even layer of grease along the entire length of the spring. A little excess is acceptable, as it will be removed later before reinstallation.
Checking coverage
Lay the spring flat and visually inspect it. Touch up any dry spots with a small amount of grease. The outside of the spring should remain dry, making it easy to handle.
Storing the mainspring
Bagging the spring
Place the greased mainspring into a labeled plastic bag. Mark the bag clearly—for example, “Strike Mainspring”—so you know which train it belongs to during reassembly.
Keeping the spring clean
The sealed bag prevents dust and debris from sticking to the grease. Store the spring safely until the movement is ready for reassembly.
Next steps in the restoration process
Once both the strike and time mainsprings are cleaned and greased, you are ready to move on to the next stage of the restoration. This typically involves inspecting pivots, checking bushings, and preparing the plates and wheels for reassembly.
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