George, thanks for the link on the CP-51 manual.
I got my CP-31 from a university as well, and it was kept in really nice shape. I wish the CP-51 I just got was that nice but we'll see if it can be restored - hopefully so.
Thanks for the idea on the recoating of the rubber rollers - good to know. I didn't realize there were places offering that service.
These are great machines and worth keeping in running order, no question.