How to Adjust an Ansonia Clock

Written by mary lougee
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How to Adjust an Ansonia Clock
Clock winding keys coil the mainspring to operate the hands. (winding key image by robert mobley from

Antique Ansonia clocks are a collector’s item, with many models and styles available. Some Ansonia clocks are handed down as family heirlooms from generation to generation. Each Ansonia clock operates manually, using a mainspring that must be wound in order to tighten the spring and operate the clocks hands.There are four types of adjustments that can be made on an Ansonia clock in order to set it to the correct time.

Skill level:

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Things you need

  • Clock key

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  1. 1

    Insert the clock key into the key hole and turn it clockwise to wind the clock fully.

    How to Adjust an Ansonia Clock
    Observe the inner workings of your clock. (background - springs image by forca from
  2. 2

    Place the small end of the clock key into the small round opening on the clock face. The opening is generally near the top of the clock face by the “12.” Turn the clock key to the “F” one turn to make the clock run faster. Turn the clock key to the “S” to make the clock run slower.

  3. 3

    Place a thumb and forefinger on the nut at the bottom of the pendulum. Turn the pendulum nut counterclockwise one turn to make the clock run slower or clockwise to make the clock run faster.

  4. 4

    Turn the adjusting wheel on the clock face one turn to the “S” to make the clock run slower or to the “F” to enable the clock to run faster.

  5. 5

    Observe the clock for 24 hours, after adjusting it, to see if it keeps proper time. If it is still running too fast or slow, make additional adjustments.

Tips and warnings

  • Adjust clocks to gain or lose time using small incremental adjustments to obtain the correct time. Using large adjustments will increase or decrease the clock movement by several minutes and will take longer to adjust up and down.
  • Turning the nut on the bottom of the pendulum increases and decreases the pendulum length by a small amount. Turing the nut counterclockwise makes the pendulum longer, so that it is heavier, thus swinging slightly slower. Turning the nut clockwise pulls the pendulum up, making it shorter and lighter, thus swinging faster.
  • The adjusting wheel and small keyhole adjust the clock movement inside the clock to run faster or slower.
  • Clock shops sell replacement winding keys for Ansonia clocks.

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