I just bought an APO-Symmar 5.6/135 lens in a Copal No. O shutter. When mounting it on a lens board, I noticed a small protruding screw head, about 1/8", that doesn't allow for a flush mount on the board. Is this by design? If so, does it affect the parallel plane of lens to film? Should there be a recessed hole in the lens board? I'm a bit puzzled about this screw since other lenses do not mount the same. Help me out, please? Thanks
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