Here's where I get to plug my web site:
http://www.thebattles.net/sol20/sol.html
You may want to seek out the section on repairing the keyboard.
Thanks, Jim. Googling for SOL-20 already turned up your site pretty prominently,
and I today bought a bunch of Sun 4 keyboards for $1/ea off eBay to savage for
the pads! Hopefully they've still got some life in them ...