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If the clock has a pendulum, remove it before disassembling the clock.

 
Inspect the mechanism for damage, then apply lightweight lubricant as needed.

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A clock is an instrument for measuring and displaying time. Mechanical clocks are driven by spur gears that are powered by either a falling weight or an unwinding spring that turns the hands at a precise rate. The main shaft then turns the hour, minute, and sometimes second hands around the clock face to indicate current time.
To clean a mechanical clock:
- Carefully remove the clock mechanism from the case.
- Pour a cup or two of turpentine or paint thinner in an empty coffee can or similar metal container.
- Place a small-mesh screen or cheese cloth over the top of the coffee can and, if necessary, secure it to the can with a rubber band around the can's perimeter.
- Set the clock mechanism securely on top of the can so the chemical vapors reach the internal parts.
- Allow the vapors to work on the clock mechanism for at least 12 hours before removing. Carefully use a small brush to remove any debris.
- Lubricate the clock (see below).
To lubricate a mechanical clock:
- Carefully remove the clock's back cover to access the interior of the clock. Some models require that the clock mechanism be removed from the case.
- Visually locate the working gears in the clock. If possible, wind the clock and watch it run for a few minutes to determine which are moving parts.
- Use lightweight oil to lubricate gear shafts sparingly. Wipe away excess oil.
- Replace the clock back or the mechanism in the case.
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