Bruce: You might check some of the links on this web site repair manuals and check with Ed Romney, His widow is still printing Leica screw mount manuals, Or order Rick Olesons cd. Don
For Feds and Zorkis the "Maizenberg" would be a good source. I think the exact title is "Maintainance and Repair of Russian Cameras" it is still on Ed Romney's website. http://www.edromney.com/
For a first glimpse of what is inside a Fed or Zorki have a look here: http://jay.fedka.com/ That's Jay Javier's Fed and Zorki survival site.
