I know the OM-2000 isn't a REAL Olympus (it is so obviously a Cosina that, if it had a K-mount, it's be a Ricoh), but I was wondering if anyone knows how to fix a sticking mirror. The issue: When I press the shutter button, the shutter clicks, and the mirror stays up. This does not happen all of the time, and the mirror drops down with a little shake, or by moving the aperture ring. And it happens mostly with a Zuiko 50mm f/1.8 lens, and less (though occasionally) with a Tamron zoom lens with the Adaptall-2 OM mount adapter. I suspect this is either a gear that needs to be lubed, or a sticking bumper, but before I start poking around inside, I'd wouldn't mind having an idea of what to look for. I'm mostly a Minolta and Pentax guy (no disrespect to Olympus; I have an investment in glass), and I've solved this problem before on SRTs. This is my only Olympus; part of my collection for students.