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Another great set Phillip!
Phillip, how did/do you go about when it comes to infinity? I've been on my way to grind my retainer ring for many months now. Finally last week when I meant to screw it off to grind the ring in safe distance from the lens. But found it seem like a full section of rear glass group will be screwed off. So I stopped as I am very novice at lens surgery. Now I am leaning towards dremel it on the lens with a lot of tape instead.
I grinded down the retainer ring myself, and it is rather easy if you unscrew the rear lens group like you did. I then placed a sanding paper flat down on a table and with the lens group held at an angle to keep the rear lens from touching the sanding paper, it was easy to sand down the retainer ring without harming the rear element. Still canīt focus to infinity though, but I think my 5DMkII has less clearance than average.