So I picked up a Nikkor 210/f5.6 for my Toyo field camera. It is in wonderful shape but when I went to mount it to the lens board, I noticed I couldn't get a snug fit. So I took it apart and found something odd. Upon removing the lens elements, I noticed a tiny screw sticking up from the black inner ring which is surrounded by the aperture blade diaphragm (the diaphragm has 2 tiny screws attaching it to the shutter and they are fine). It won't screw in all the way so I took it out. For the life of me, I can't figure out what this does. I just took it out and everything seemingly works fine. I just wonder if I should have left it in there and if so, why?
Thanks in advance for any help!
MC
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