Classic watches, watchmaking, antique tools, history, vintage ephemera and more!

Learn about mechanical timepieces and how they work, the history of the American watch industry and especially all about the Elgin National Watch Company! Check back for new content daily.

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After the initial overhaul, I test watches for full runs (24 hours) in several positions, a number of times.  It's not unusual for a watch to need more work, even after working well for a few days.

One frustratingly common problem is a slipping cannon pinion.  The hands ride on the cannon pinion.  It's designed to slip when the watch is being set.  But if it's too loose, it slips all the time and the hands don't move even as the watch ticks away. 

On this watch I also found the second hand was too loose and needed to be tightened.  I use the same tool to tighten both the cannon pinion, and the second hand.

Next the tests start over from the beginning.

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