I need some help please I bought a Nikon/Nex adapter and clicked the Nikkor 35mm 1.8 DX lens into place but now it won't budge! The adapter has a small screw in the top but I didn't touch this when I screwed the lens in, either before or after. It unscrews fully and comes right out but doesn't seem to make any difference in untightening the lens. HELP! BTW, fortunately I didn't attach it to the camera.