I am trying to dissasemble a 210mm/f8 G-Claron, to mount into a Copal 1 shutter. The rear element detaches very easily. The front element only protrudes some 3/16" from the body and it is not easy to get a good grip on. I am wary of damaging the front element in trying to remove it. Is there some wrinkle or tip that I should be aware of, to make life easier? I would be most grateful for any advice Colin Myers