Thanks Tom 1956. I have serious shaky hands so I seriously doubt I want to tackle this on my own, but I do find it very interesting. I have done a bit of work on some of my older and inexpensive Agfa folders with variable results. The first did not work out very well but the second is actually running though I have no idea if the speeds are accurate. I guess I should find a shutter tester so I can test it.
I will never be a camera tech but it is fun to play with my own stuff.