I entrust all my watch servicing to アヤセオプト, five minutes from Ayase station. The guy there is a dream, does work for a reasonable price, and has been extremely helpful in sourcing replacement parts. He's a big-time Omega enthusiast and seems to enjoy the challenge of hunting for whatever you need. If you're in Taito-ku, it would seem to be conveniently located.
Edit: Oh, sorry, maybe you were referring to アトリエキノコ up there.