i've just recently pulled all my old ME Super kit out out of storage and found both the Vivitar (Kiron)) lenses had stuck aperture leaves. the 28mm f/2 i was able to find info on cleaning based on the 24mm (and i'm happy to report they're quite snappy now), but i can't seem to find any info on the 75-205mm. i'd really like to try and fix this myself, so i'm wondering if anyone has any insight into getting to the leaves. i removed the mount and the 3 screws behind the focus/zoom ring (it's 1 touch) but i was unable to get the leaves to close like i could w/the 28mm and i couldn't get the barrel apart. thanks for any help!