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Showing results for tags 'power reserve'.
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Recently replaced the mainspring in a vintage watch (a Westfield 7j). Cleaned and lubricated watch. Worked fine for several days. Now I have a problem in which it stops before the mainspring is fully unwound--power reserve appears to be less than 24 hrs, but I haven't done a precise check. Just noticed this morning that it was stopped at about 0530. Prior to this the watch had good power reserve and the mainspring fully unwound--power reserve over 30 hrs. What kinds of things might cause this?
I'm really interested in finding out what main characteristics in a mechanical watch decide how much power reserve one can achieve. Can an existing watch be retro-fitted to enhance power reserve and is it recommended? I'm thinking does it impact on the other components in a watch?