I would be willing to offer photos and measurements for most of the metal holders that I have. My collection is in no way comprehensive, but I have quite a few.
When I embarked on collecting these holders (and cameras) a few years ago there was a dearth of information on-line about them. I could find a piece here and a tidbit there, but having a large collection of information in one place would have been a great help. I think photos and precise measurements would be very informative. People often give the part numbers but that doesn't help much without images to go with them.
The question is does someone end up spearheading this outside of the APUG forums or do we rely on one forum thread to contain all the data?