Vintage Synth Repair

Just wanted to introduce myself as a new member to the group..gonna
spend a little bit of time reading old posts to see what goes on :o)

I have a studio and usually repair everything myself with a bit of
online help of course.  1. Its cheaper 2. Its usually quicker 3. I
trust myself better. 4. I like to take thing apart!

Synths in my studio are: Solina string ensemble, Roland Juno 60,
Roland JX8P, Roland RS-09, Roland RS-505, (yeh I like string synths!)
various boxes like tr909, 808, TB303 oh and a half working Yamaha
SK20..which I'll probably be asking questions about soon.

Anyway first question is where do get replacement tactile switches for
a roland TB303? Im fed up with mine being intermittent.

Thanks, Phil.