I recently acquired a nice old Nikkor-H 50mm F/2 which had been converted to AI in a way I haven't seen before. Instead of the usual milled notch, the "bunny ears" have been replaced with a small L-shaped metal piece which engages with the aperture follower to operate the AI feature. It seems like a neat and non-destructive idea. I just wondered if anyone has seen this, and whether there are any drawbacks. Also, is there a source of these little brackets? Mine does not look home made.