Now that we have polished our pivots, it’s time to examine out pivot holes. Odds are that they are worn, especially if the clock has not been serviced for a number of years. Worn holes will eventually stop a clock from performing properly.
As you can see in the picture, the hole is badly worn. As the springs or the weights always push the wheels in the same direction and thus create wear in the same direction, too, we will have to centre the hole before we can install a new bushing. It is critical that the bushings will be centered perfectly; if not, the clock will not function according to specs.
To centre the hole, we have to use a small round file, a so-called rat-tail and file it out until it is centered, being careful not to make it bigger than the standard bushings. When we are satisfied that the hole is now centered, we drill it to the appropriate diameter and insert a new bearing and the clock will once again perform properly.
The reason so many clocks have worn bearing is because too many clock owners neglect to have the serviced regularly. It is recommended to you have your clock cleaned and oiled every 5 years, just like you would change the oil in your car every 5000 km. When the oil in your clock gets old and full of dust, it will eventually turn into an abrasive sludge that will accelerate the wear process! A properly maintained clock will last for generations. And for goodness sake, don’t try and save some money by spraying your clock with WD40! (don’t laugh; you wouldn’t be the first)