Felsa 362 balance wheel problem

Gra

Registered User
Jul 23, 2020
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I have serviced my grandmothers wristwatch which has a Felsa 362 movement, however, every now and then the balance wheel gives a stutter, as if it has bounced back, then continues to rotate fine for another 20 seconds or so then stutters again.

Having stripped and rebuilt twice I can not find the cause, has anyone any ideas please.
 
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