I'm a watch tinkerer, in no way a "watchmaker", which is the person you need for a happy result.
I've done a couple of basic services on Seiko movements as that's what I've been learning on.
Also done some basic work on Omega 601 and earlier movements and I just enjoy doing things like bringing an old pocket watch back to life.
I'd be very reluctant to attempt any detailed service on a watch I didn't own unless it was of low value and the owner accepted the fact that it may not end happily.
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