I take it that you figured out that the set screw is to hold the setting of the elevation... supposed to loosen it before turning, and then reset it. Good luck with it. I had a Voightlander fixed power with single post reticle in claw mounts once. It functioned OK, but the tube was the metric equivalent of 7/8 inch, so was not as bright as I desired at the time. Deutsch Optik at one time did refurbishing on older german scopes. Steve