Make sure the clock is level on the wall. The clock needs to be level
front to back and side to side.  Mark on your wall to indicate where your clock hangs level.  It is level when the “Tick Tock” beat is perfectly even.  You may have to tilt the clock a little to the left or right to get the beat even.

Make sure the pendulum guide is not touching the wood on the bottom of the clock. If the pendulum rubs on the wood it will cause the clock to stop.