I recently was given a 52mm reversing adapter for my Nikon D40. The thing is, it's for the old AI lens types. So I was wondering: Will this work fully with my Nikon D40? It won't work with the starter lens, I know, but I also have a Nikon AI 50mm F1.8 lens that it will work with. I guess what I really want to be sure of is if it won't damage the body. It scrapes a bit when I put it on, but I'm sure a bit of grease will fix that. Thanks! Also, I've noticed a little screw sticking out of the adapter. Will this affect anything?