Originally Posted by CharlesDAMorgan
Received and understood Ko.Fe!
Now to do my research on shimming.
I used one manual from Brian Sweeny, but could find it anymore.
Basically with J3 you need to remove entire lens block from focus assembly and on lens block you will see shimming ring. I'm using it as template and cutting additional from paper. Most of the times I need to add one.
Only tricky part is to shift focus scale ring after it. It requires drilling three new locations to where three holding screws will screw in.
Those three screws are extremely small...