Bob Weigel of http://www.sounddoctorin.com documents his contact repair invention. (for more details and a .pdf that gives better visuals on the details, go to http://sounddoctorin.com/synthtec/parts/key.htm#polycontacts ) A material created for NASA is backed with 3M adhesive and cut into disks the size of typical Panasonic, Fatar, Roland and casio contacts (or close enough to work :-). ) Other companies have offered paint which often doesn't work and then you have a bunch of paint with a rough surface stuck to your contact. Not to mention it goes bad in 72 hours and you're out 40 bucks or so. These disks have a great look and I'm sure probably a long shelf life under normal conditions. So you can keep them ready to go and just use them as needed. We can cut the material to do the concentric ring contacts found in K1000 series Kurzweils, Kawai K1, K1II, K3 and K4, Akai AX80, Fender Chroma Polaris and SCI Multi-Trak I believe also. But so far these seem to clean up every time I deal with them. So we have some spares. However I've run into several Polysix's that simply would not clean up. And some Fatar types in Peavey DPM3 as I recall. So these should work in Korg Polysix, Poly61, Poly61M, DW6000, Peavey DPM2, DPM3, DPM3SE, DPM SI, Kurzweil K2000, Roland JUNO-6, JUNO-60, JUNO-106, Alpha JUNO-1, Alpha JUNO-2, JX-3P, JX-8P, JX-10, D5, D10, D20, D50, D70, U20, Rhodes 660, 760, MK60, MK60 and the other RD series keyboards and a host of others. Moog Memorymoog, Oberheim OB-8, Matrix 12 I believe and many others. Seiko DS series keyboards I believe also. FURTHERMORE these work GREAT repairing buttons that press against contact traces on circuit boards (Siel DK80 for example which I did the other day. DK series use spring contacts I believe though on all of them.)
NOTE: These work great for other things. Here's a note from Vince Ferragamo who used these on the remote for his '84 Buick:
W O W did they work great. It took me about 5 minutes to place those pads in the remote Their size was exact perfect. In fact it took me more time to walk out to the Buick. Worked perfect. Maybe you should make a video " re-do auto remotes." If you don't make a video just mention it in one of your other videos. You can't buy a new remote for a 94 Buick. You made my day.
Thanks again
Vince