As some of you will know, I have a 65mm f8 Super Angulon which I have built into a 6x12 camera. The lens is in a Synchro Compur shutter. Schneider's data sheet suggests that it is fitted in a Copal shutter. A while ago, one of the shutter blades fell out and I haven't got round to having it repaired yet (I will). However, I noticed that if I stop it down a bit past f11, the gap in the shutter is masked by the aperture blades. I have been using it stopped down to at least f16 and have found no problems. I even tested it by pointing it at bright sunlight for a while with no problems. It works but is not ideal. Anyway, that's irrelevant to my question. My real question is: There are quite a few folding cameras which use what look to be similar size shutters. Is there a Prontor or similar shutter which will have the same 22.5mm diameter threads and the same spacing which I could get as an interim measure before I get my shutter repaired? Steve.