So I finally decided to purchase a split image focusing screen for my Nikon D200. I use some MF lenses and focusing is quite a problem without the split image help -well, at least for me. The problem this post is about is the following: I first took the "old" screen off, no problem there, but when I went back to the camera to put the new one in, a little thin metal frame suddenly appeared. I don't mean the clip that is used to keep the screen in place, but rather a loose frame that is obviously supposed to somehow protect or, at least, rest properly the screen in its place. And here is the problem: since I did not notice at all that frame when disassembling (??), I just don't know whether it is supposed to go in between the pentaprism and the screen (back the screen), or in between the screen and the metal clip that keeps the screen in its place (front the screen, from the mirror's or lense's point of view, if you know what I mean). Any idea how it goes? I would like to mount everything properly.