Pentax M 50mm f2.0 Lens Repairs

I have received bunch of lenses from my friend to see if I can make some working lenses by swapping parts around. They were all in bad condition. Some had focus jammed and others had bad lens coating problems caused by molds or fungus eating away the lens coatings.
It is a bad idea to buy lenses from humid states such as Florida and Hawaii. I bought few old lenses from Florida and most of them had fungus and they did damages to the lens coatings.

I made one working Pentax M 50mm f2.0. Yesterday I made two working Canon FD 50mm f1.8.