Sorry to hear about your horror story. Having a precious watch ruined or botched by a "watch butcher" is a real nightmare for any watch enthusiast and collector. I hear similar stories from gun collectors, etc.
As much as I despise the outrageous price of "full maintenance service" that manufactures impose, I always take my TAG-Heuer to the local authorized dealer (that is also Rolex's AD) with their in-house watchmaker and my Omega watches to the closest boutique to make sure that my watches will be brought back to the factory specs with genuine factory parts by factory trained watchmakers (or technicians). And the service comes with the factory warranty.
The downside of taking my watches to the AD and boutique is, of course, the high cost of regular maintenance. That's why I will probably buy one more watch and no more...
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