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Longines Admiral 8581-2 Calibre 431

A strange complaint from the client... He sets the watch, and after an hour or so, it's 10 minutes slow. From then on, it keeps good time!

I suspect that the cannon pinion is too loose and slips, and that is indeed the problem.

The date change wheel has broken off, which is quite a big pain, as I have to put the plate in alum to dissolve the left-over bit, and then re-cut the thread. On top of that, I have to turn a little adaptor ring for the screw on the lathe which is 8/100mm thick!