Welcome Ken, William Robison passed away about, well, I better call it a few years ago. I'd put my money on that 1.50 getting its compression back with about 10 minutes of running. If dried castor was making the bearings rough it would also stick the ring. New stuff won't hurt a thing though and then you know for sure it's up to snuff. My collection used to be about the size of yours with a .90 triple, a TS .90 and a 1.30 twin thrown in. Hard times hit and best ones went away to other homes. I'm down to the aforementioned high compression 1.50, an 80's high compression .80, an early .62, an older FA .40 and a little .30 that William Robison painted the cylinder black.
Pete, are you sure I'm grumpy, naaaah.
