I was playing around with my CL and the collar around the shutter release was loose. So I, instead of tightening it, I unscrewed it, just to see what it looked like. I screwed it back on and now the shutter release no longer pushes down. The film advance lever had been turned before I did any of this so the release should work. The camera is/was in perfect, functional shape. Does anyone now what the problem is? Any suggestions as to what to do?