Looking forward to the results of the experimentation sir... thx...Very interesting thread. As someone who only has one frame, and several different lens options, the C-rings can be a pain, but I have found that using a small screwdriver between the frame post, as mentioned by @Oakley OCD and @Alternative works very well, (the smaller the better as shown in Alternative's example), but in the spirit of experimentation, I ordered some small rubber o-rings earlier this past week. When they arrive, I'll try them out, and let you all know if they are worth exploring or not