What does a cleaning (overhaul) involve?
A cleaning requires hand oiling, in the right amounts and in the right spots. Too much oil can be worse than not enough. For a good servicing, the watch needs to be completely taken a part. All parts must be inspected for damage and wear. Any broken, worn or missing parts need to be fixed. The parts need to be cleaned, usually with an automatic cleaning machine, and then inspected to make sure the parts really got clean. The watch must be reassembled, and checked to make sure it is running well in all positions. If the watch isn’t running well in all positions, the problems must be diagnosed, fixed, and possibly the watch will need to be re-cleaned and re-oiled. Finally, most watchmakers let the watch run for at least 24-48 hours to make sure everything is working right.
