Hello! I recently acquired an old Sensorex and I've been having trouble with the Viewfinder prism. I removed it while inspecting it and now, it won't snap back. The elevated edge of the viewfinder doesn't go over the rim of the camera, but the rails are well aligned. Wondering if it's a known problem or if I am, in fact, the problem. Pretty much every video I've seen on Youtube show people just sliding it back on and it clicks back. I was thinking of buying another prism (perhaps waist-level viewfinder) to replace it, see if it fixes the problem, but they're not exactly cheap and I want to make sure it fixes the problem. Anyway I can send some pictures if it helps, any suggestion is welcome! Thank you!