I am in the process of buying an RB67 ProS with a 90mm 3.8 C lens (includes two ProS 120 6x7 backs) from a friend and he let me borrow it for a few days to see if it was still working properly. I shot two rolls yesterday and I will find out over the weekend how they turned out. I have never used an RB67 before, only 645's, so I have several questions. 1. Why does the mirror stay in the lock up position after I snap a picture? (Yes, I found out that it returns back to the normal position after I push the small crank or handle on the side of the body) Is this normal? 2. It currently has a waist level finder. Can I purchase a finder with a built-in meter like the ones available for the 645 models? If so, any suggestions on a model number? 3. The camera is lighter than I expected but is somewhat awkward to hold while focusing, film advancing, shutter cranking, and composing the shot. Are there any decent handles (other than a handle mount flash setup) available for the RB? 4. Are the lenses, backs, finders, and other accessories compatible with the RZ67 line? 5. I am getting the camera with two 120, 6x7 backs. I have seen several different types of backs for the RZ67. Other than the 645 backs, poloroid backs, and 220 6x7 backs, what other types are available? 6. Can I fit newer non-C lenses on this body? 7. The camera is over 20 years old and the rubberized areas are starting to peel. Is there any recommended glue out there I can use? 8. Are there any split screen focusing screens out there to make focusing easier? Thanks for any help you can provide. This is a cool camera and the lens seems to be near mint (no spots, scratches, fugus, or imperfections noted).