My 90mm Graflex Optar has a round protrusion on the back, 3mm in diameter by 3mm high, that won't allow the retaining ring to tighten the lens to a metal lensbo ard. As it is I would have to drill or file a slot for the nub to seat the lens flat to the board. But it still won't allow the retaining ring to tighten down. Did they use spacers for this lens?
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