Carl Zeiss Jena pancolar 2 / 50 exakta disassembly helicoid stiff focus access glass 2 clean fungus

i did originally do a video from unboxing to fixing this lens all in one shot,having never worked on this model lens before .
it was bought very affordable price owing to its bent focus ring, stuck focus, lots of dirt and fungus on glass.
but it turned into 3 hours of me twisting parts slightly out of shot, for a viewer trying to get insight from it would have caused annoyance .
*** the ring holding the front element was very stuck ,so i made a keyway with a small file for the lens wrench to turn it.
***focus ting was bent at its front edge preventing the disassembly ,pried at it with screwdriver just enougth to clear the edge, when dismantled i used a filter thread ring repair tool to even up its roundness,
*** front element has fungus damage aka glassrot , i cleaned it but it will never be 100% ok