I came across a 240 G Claron when a photolab was closing down. I have tried to mount it in a Polaroid Prontor #1 but there seems to be a ridge behind the aperture blades that is preventing the rear element from going in more than a single turn, and tightening it down interferes binding the aperture setting. So I am thinking I need another shutter. I have only seen Copal press shutters on ebay without a lens, inexpensive but looks like a copy of the Prontor Press. Also how to find an fstop scale starting at f9 would also be nice, the current Prontor has an f4.5 scale and the couple of time I have used the lens I have just doubled the fstop reading, probably not exact but the negatives have been OK. Any advice would be welcomed.
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