Yeah, I started on that a few years ago and have an entire tool box (my grandfather's) dedicated to watch tools. The O-ring wax jar is useful but even more so if you have a large assortment of O-rings so you can replace them, too. You can usually get a large assortment of like 100 rings for nearly nothing on Amazon. Since many of mine are Victorinox who my local AD (also a TAG AD) tells me makes many of TAG's movements, I also laid in a supply of batteries and recently did a friend's TAG-Heuer. I also keep a supply of pins for bands, etc., and the jigs and tools for replacing those, too. Fun!
I think I got started when no one locally would re-seal my Seiko Giugiaro-design "motorcycle" watch. An original to me as worn by Senna.
