Nikon F2 - Winder Lockup or Double Winding problems

Resolving Nikon F2 symptoms of Winder Lockup and Double Winding
Nikon F2 possible fault solutions for

1. Double winding of the film winder arm. It feels like you need to take up the slack first before the film winds on fully.
2. Winding on feels like it is catching something, or it fully locks up as you try to wind on. May only happen at certain speed settings.

Here is a break up of the possible solutions.

1. Underneath the main shutter spool a small spring...

Click to expand...