Sparky,
Wow, I just this week had to return an Ais 55 2.8 Micro-Nikkor due to frozen up aperture (wouldn't stop down at all) and there was grease almost dripping off the helicoids.
ePrey seller must not have even tested the lens at all. The description was completely bogus because I knew about this issue.
The 50 f/2 with fungus is pre Ai "H".
Do you (anyone) have any links to what's involved at getting to the front inner element group.
Hopefully the fungus hasn't etched the glass yet. There is one fair sized growth in there.
It might clean up.
Im paranoid due to the contagious nature of fungus but the environment around here shouldn't be too accommodating to further growth.