Hi Douglas,
hope not to bore you, but following your opninions and (being me very curious) I bought a Hexanon 135/3.2 to compare to my CY Sonnar 135. Now, I'm after the conversion, at least for macro and portraits

. I just removed the black "metal" of the mount (one micro screw didn't go well adue to a cheap micro screwdriver and I forced it a bit).
I just thought of opening the back, disassemble the lever protruding inside the camera, and have a look through the viewfinder. But it seems I can't put the steel/aluminum lens mount out of the barrel, because of that black metal "thing" (I hope you can follow my bad english...).
Have you got any idea? I'd like not to Dremel the lever out, but if it is not possible otherwise, I'll do it
Thanks for any help,
Stefano