I'm trying to open up a Canonet - either front or back - to fix a stuck shutter. Neither the front or rear rings budge. I picked up a spanner kit from microtools with the hope that proper tools would help. No luck. I'm new at this so I tried removing the rings on a few other cameras just to be sure I wasn't making a mistake. They moved with little force so I don't think I'm missing anything basic. I'm stopped when I realized that I was starting to strip the rings themselves. The camera is dead as it is but I want to step up the potentially destructive techniques slowly. I'm not looking to have the camera profesisonally CLA'd; I want to learn about this stuff and am saving the CLAs for higher end cameras. Does anyone have tricks, suggestions or links with info they've found useful? I've looked around at solutions for a few days but haven't found anything yet. I haven't tried drilling yet (mostly lack of gear) but that is something I'm holding off on that for now.