I've got a problem with a mamiya C3. The film advance often sticks - it is failing to register that the shutter has been released. It'll just need a little oil in the right place I guess, but i'm having trouble working out how to get into the camera.
Ok, sorted. Found a C33 guide and this gave me the confidence to strip the leatherette to reveal all the required screws. Dismantled, cleaned, oiled, now working really smoothly.