I am helping a work colleague with a box of old cameras that she was left by her Dad. They have been sitting on a shelf for 20 years or more I think. There is an MPP Microflex TLR (Nice), a Zenit B and 58 f2 (not so nice) a 4 x 4 Primo JR made by Tōkyō Kōgaku, a couple of PK lenses (both Tokina, 28mm and an 80-200) and a monster TAIR 300mm f4.5. The Primo is a bit bashed up, but the rest of it seems to be fully functional, other than the fact that one of the film rollers on the Microflex is a bit rusted through the chrome over about half of the roller at one end. As is it, I’m sure this would scratch the film, or at least flakes of rust could get into the mechanism. Any ideas how best to get this back to a smooth condition? I’ve thought about using a proprietary rust remover such as Japlac, but this might take off the good chrome finish?