Originally Posted by Lowell Goudge 
Nice work.
It takes a lot of patience to but all that back together.
DId you ever find out where the open circuit was?
Just curious
All except one of the contacts was open circuit. The springs form the electrical path between the contacts on the mounts internally, expanding and contracting to maintain the circuit as the helicoid is moved in or out. The springs each hang on to a row of small "L" shaped lugs on the contact strip directly beneath the rear mount. It really was a simple but fiddly matter of re-hanging each spring onto its lug. On my copy all but one of these springs had jumped, fallen or been shaken off the lugs. I don't intend to drop-test it to find out which.
If anybody intends to open theirs to fix it, may I recommend that you lift the lens off the mount, rather than lifting the mount off the lens. This will keep all the sprung pins in their correct postions in the mount. If any fall out, they appear to be completely interchangeable and it becomes quite obvious where they belong.