I've got a "Whatzit" for you... It came in the box with the second hand Omega D-II enlarger I got from my uncle. I thought it was a negative holder but, when I was packing things up to put them in my car, I really didn't spend too much time thinking about it. I was more worried about packing things up and getting them home without breaking anything. It wasn't until I got everything home and started sorting it all out that I gave it a second thought. It certainly seems like some kind of negative holder but it doesn't fit the stage on the Omega enlarger. Anybody have any ideas? T.I.A.