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Clock  Adjustments

1. Setting Up Clock Correctly

  • Set up clock in a level position

  • Attach pendulum (when applicable)

  • Attach weights (when applicable)Place finger on either side of pendulum and carefully move pendulum 1 inch to one side or the other to start swinging motion.

  • If clock is level, the ticking of the pendulum will be will be in perfect rhythm from left to right.

    • If not in perfect rhythm, steps must be taken to relevel clock.

      • (Example: reposition wall clock by moving the base of clock slightly to the left or right until ticking is in rhythm OR position a pad of paper on corner of the clock.)

  • Set to correct time

    • Go forward (only) on minute hand and allow clock to chime and/or strike at each sequence.

2. To Adjust Time

  • A Initial adjustments have been made to correct the fast/slow speed of your clock, but final adjustments must be made at home.

  • Most pendulums have a BOB on the end of the shaft and a nut below.

    • Screw nut clockwise to speed up clock

    • Screw nut counterclockwise to slow clock.

3. Clocks with Pendulum

  • Adjustments are made by raising BOB (to increase speed), or lowering BOB (to decrease speed)

  • Some clocks have an adjustment nut at end of pendulum

    • Turn clockwise (increase) to adjust fast

    • Turn counterclockwise (decrease)to slow down clock.

  • Some clocks have an adjustment wheel on face of clock and letters are normally printed F (fast) S (slow) and wheel is turned to adjust clock


A General rule of thumb for grandfather clocks is 1 full revolution is ¾ of a minute.

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