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Author Message   Thamnophis Tinkerer Username: Thamnophis Post Number: 6 Registered: 03-2013 Rating: N/A Votes: 0 Posted on Monday, March 25, 2013 - 03:08 pm:    Finally. After too many hours of trying, I got the rear mount back on and working. Eventually I had to open up another Canon lens of the same vintage to see what I was doing wrong. It was simply a matter of rotating the rear aperture selector once it was in the fork passed the mount lock tab, then aligning and inserting. These things make Ikea furniture look easy :-) But everything cleaned up nicely (lighter fluid worked well)and the lens takes nice contrasty pics now. So thank everyone!