Odd question. I have a 210/360 Symmar convertible in a Linhof shutter. The shutter works and the lens is pristine, but the black, ring-shaped cover that goes on the front of the shutter, and that has the aperture scale engravings, has been ripped off at some point. I'm contemplating gluing it back on with rubber cement or something. The trick is figuring out how to rotate it so that the aperture scales line up accurately with the aperture lever. The trouble is that the aperture lever swings farther than the full scale of the aperture engravings. I can position the ring so that it reads f/5.6 with the aperture blades fully open, or I can set it so that it reads f/45 with the aperture blades fully closed. But not both. Which do you suppose it is, or could it be somewhere in the middle? Would this lens fit in a different shutter?