At this point many of the camera made in the 70s to 80s are starting to show wear, from what I have experienced (Nikon FG, Chinion CM4, Vivitar XC3, and Spotmatics) it is the internal meter that fails. Models with electronic shutters are dead in the water and cannot be repaired due to shortage in parts. A local repair person claims that he can get circuit boards for the FG from Korea. Because I have a large selection of Pentax M42 lens I plan on keeping my Spotmatics and Chinions going for as long as I can, if a clean Mamiya comes along I would pick it up.