I've been looking at adapters for my Minolta MD 50mm f1.7 (bought new in the 80's). The cheapo Chinese ones all appear to have a tiny set-screw in the camera-side mount, though it's hard to tell for sure from some of the pictures - suffice to say I haven't seen one that doesn't have something that looks like a set-screw. That bothers me - first, it indicates that the mounting is somewhat loose or poor quality, second I would think it might damage the camera body mount. So if you have one of these, does it have a set-screw? If so is it required to keep the adapter tight on the body? The non-cheapo (ie quite expensive) alternative is the Novoflex, and I can't find a picture of its camera-side mount. I haven't found any other high-quality adapters for this lens.