I once had a used K1000 that had in inaccurate meter. When I brought it in for service, I was told that later K1000s built in China sometimes had welds that were too cold. The welds could break, messing up an electrical contact or making it intermittent. I never knew what to make of this explanation, but it seemed credible and I had no reason not to believe it. A good tech can take apart your camera and check it over, rewelding if necessary. I had this done, and thought it then metered better. This was a few years ago, so I don't recall all details of how it performed after the repair. I did use it for a while, then traded it in.
Joe
