Here I explain what causes Contax SLR mirrors to "slip" and one way to address the issue.
Edit 11/14/2011:
To all who view this: I have a confession to make. The mirror started sliding back down over a period of weeks, even though I was not shooting the camera. I used the heat gun to move the mirror up again, and actually got if more "flush" than it shows here. I will be watching it to see if it slides again.
There is another guy out in the internets that ended up kind of "gluing" his mirror into position using silicone fish tank sealant along the junction of mirror and plate. I may try that.
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