Dear John, Prontor SVS shutter is what I think very good in quality, I believe that your problematic shutter will be easily repaired, but if you would like to replace the shutter, almost any #0 shutter can be used, only problem is that the trigger is not so long in length as SVS has, so maybe you need a release cable to trigger. And the lenses, as long as the rear element is small, can go through the hole on front stand, you can pick any one. All you need is a wrench for lens, and a screwdriver only, take off and remount from inside, it is easy.
Or you can follow the way Mr.Littman suggested on his site (not anymore now, don't know why), for the purpose to use the big rear element lens but without the lens exchange ability, take off the rear element(even front element!) when folding the camera, leave only the shutter, cover shutter with a tiny cap, and when unfolding the camera, remount the rear/front element back to the place.
In my way, lens exchange is very easy, but it needs some modification on front stand, and for accommodation big rear, better replace the bellows at the same time. I do think of providing a service, convert front stand for anyone who needs it, into a exchangeable system.
Last edited by salihonba; 07-07-2009 at 11:53 PM. Click to view previous post history.