I did successfully solder the wire, at least...

The root of the problem - the inner cylinder slips off the rails and gets stuck, locking the lens

This is the assembly inside of the lens that zooms in and out and controls the aperture - it slides on two types of rails

Seating the aperture cylinder back inside is the hardest part - I had to deduce how far along it should be slid in based on looking at another lens - if you try to do it vertically it just slides on down to the bottom and gets stuck again

Pretty neat aside - how the aperture is controlled