Thanks, that's another possible source I haven't thought of. Both companies' websites say they only sell to dealers and piano technicians (like the jagoffs at W.W. Grainger who really pissed me off a few years ago refusing to sell to me, and I even
had a business name at the time!)
We don't have a "local piano store" and the town music store wouldn't have the faintest idea how to help (or be interested in doing so) if I walked up to the counter with a p/n in hand and said "I need 20 of these".
Anyway I think his info may not be correct, at least as it applies to my 630's. That poster said the 630 feet have "head dia. 7/16" X 11/32" stem dia." although a 5/16" drillbit won't even enter the case hole except the very short chamfered top. A 9/32" bit is slightly loose in the hole. So I think a 5/16" stem would be a better fit. Also the Pianotek catalog shows the RBNT8 as actual size and it looks nothing like the foot that is supposed to be there.