Hi, and grats on owning an RG 10".
I still have an RG 10" (one off f/4.5 from Meade that way). I have also owned several RG12.5 f/6's.
RG's are wonderful visual scopes and very user friendly as well.
I've seen all the adverts showing them with the cameras mounted. Let me say that's nostalgia at work there. Manually guiding with a guide scope and a film camera, using a mount that has a bit of slop to it (no ball bearing on this mount) is not what you want in this century.
Don't get me wrong - I LOVE RG scopes - for visual use. On wheels - roll it out of the garage to the driveway, plug in the extension cord - boom! you're observing in two minutes. Then it takes 2 minutes to roll the baby back into the garage - Sweet!
I would not want you to waste your time trying to "restore it to former glory" when the idea doesn't work in this century.
Spend your time collimating, using, enjoying your scope. And upgrading too. Lotsa work to do there. I upgrade my 12.5" RG with a new better diagonal, a better focuser, a Novak mirror cell, better primary, etc.
Check your mirror coatings. For sure CHECK your diagonal/spider!!!!! Originals were pot metal and prone to total failure. A new Astrosystems diagonal holder and spider assembly would be my 1st recommendation.
good luck and enjoy the RG.