The bob will settle lower making the effective length of the pendulum longer.
How to fix a wall clock that runs slow.
The first and easiest problem to fix is restoring the clock s battery power which is done by removing the battery from the back of the clock and replacing it with a fresh one.
How to troubleshoot wall clocks.
It is possible to install the battery upside down where the battery is.
You should hear a ticking sound.
Each turn of the screw slows the clock by two minutes per 24 hour period.
If your clock is running slow then there might be an issue with the wiring.
If so replace the cables with new ones and see if it works or not.
This screw regulates the speed of the clock.
Gently take off the compartment and take a look at the connections.
To slow down the clock loosen the adjustment nut turn it toward your left.
How to repair an old wall clock if your wall clock is off you will definitely replace the new battery if it remains dead.
Use the fingers of your dominant hand to gently turn the regulation screw.
If they are getting a collision or there is unnecessary friction among them smoothen out the edges of the handles with a piece of cloth.
Turning the screw to the left will lower the pendulum slightly and slow down the clock.
If not there may be internal damage.
The clock will run slower.
To speed up the clock tighten the nut turn it toward your right.
Wind the clock if it has stopped running.
Do you see any damage to the wires.