Hey everyone, I've recently picked up a FM3a and is in good shape. Everything works, including the film advance lever. That's until I put on my lens. As soon as I put on my converted Nikkor 55mm, the film advance does not advance. It's stuck. I've scourged the 'net to see if there were others who share my problem, but haven't found any. Has anyone else experienced this problem or better yet, know what I need to do to start shooting again? Any and all help is welcomed. Thank you very much.