An 8-day clock requires winding once a week, but you get a one day grace period on winding, hence the name. An 8-day clock is a precise timepiece and repairing one requires patience and skill. The 8-day clock has two winding holes, one for the weights and one for the clock movement. An 8-day clock should only be maintained by someone with experience and training.
- Skill level:
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Disassemble the clock. Examine all contact areas for signs of unusual wear. If a gear is showing signs of friction, that could be the reason for the clock stopping. Friction causes metal fatigue and worn gears do not mesh properly.
Clean the 8-day clock's clockwork with compressed air. This only needs to be done every 10 years. Dust can cause the gears to stick, and the dust should be removed at least once a decade. Place the compressed air nozzle at least one foot from the gears, as one of the smaller gears could become unbalanced by the force of the air.
Use a magnifying glass and small tweezers to remove stray hairs caught in the gears. Exercise caution when extracting the hairs as too much force could dislodge the gears. Use a soft bristle brush to gently sweep out the clock body.
Check the mainspring to see if it has become detached. A mainspring that is over wound will become detached. Examine the mainspring to see if it has been replaced, as some past repairman could have installed a mainspring that was too large for the clock.
Re-assemble the clock. Gently wind the clock about half way. This simple step is regularly overlooked.