I've got a bad nikkor/copal #0 for a nikkor lens. I've got a very new copal #0 shutter and planned to switch the shutter speed/aperture rings from the nikkor to the copal and be done with it. That part was easy but the nikkor front element and the front element from any of my nikkor lenses won't fit all the way into the copal brand shutter. I can't even get the threads engaged because the opening around the shutter is slightly smaller than the lens element. That would have been good to know ahead of time! Any suggestions that don't involve sending it to skgrimes?