I have a Mamiya m645 CdS prism I bought from KEH that was described as having an inoperative meter. I saw this as a challenge, not a hindrance. I guess it's because I'm a guy. I like buying broken things cheaply and fixing them. But I don't like to do it without knowing what I'm up against first. Does anyone have any tips on fixing this meter? CdS photoresistors are pretty cheap at Radio Shack, but I've not yet opened the thing so I have no idea what it even looks like, if it is a standard CdS photocell or something else. Is it even worth fixing it? Should I just spend the $70 or so and buy one with a working meter? Thanks for any help!