I got this lens from a kind soul that's been selling off part of his camera collection on Craigslist. I've bought several items from him and on my last trip he gave me two lenses for free because they had quite a bit of fungus inside. I was trepidatious at first about taking these lenses apart since they were pretty high end units in their day, but curiosity won out and I dug into the bigger 300mm first.
It was touch and go for a while since there are no manuals that I could find on the Internet, but I figured it out eventually. The fungus cleaned off very easily and I'm really liking the results this lens is producing. Now on to the 200mm f/2.8 that still needs cleaning!