Originally Posted by mongo141
Nice to see that one in print Wayne and I am sure many will thank you. I had two FED 1's, one that worked fine and one with a detached curtain so I had to take BOTH apart to see what curtain placement was. As it turns out some Leica copies come from the factory with missplaced curtains (Quality control not being an FSU strong point) this can usually be seen by the amount of tension on the springs, one heavy / one light they can be also be heard with your ear by putting the thing in 'B' and tripping the shutter. Both curtains should sound about the same in operation on a camera with correct shutter speeds. Dave
There are several factors that come into play, including how the big gear on the bottom of the main drum meshes with the smaller gear. for the curtains to align perfectly you have to hit exactly the right tooth.
To give an idea of the difference in time when you don't have to mess with cutain placement, I did one where the old curtaiins and ribbons were still attached and was able to put in new curtains in 3 hours and 15 minutes from the time I started disassebly until everything was back together (Zorki 1). With practice I'm sure that time could be cut in half.
If the curtains are installed properly the curtains only need minimal spring tension. Any camera Oleg does has very light spring tension.