****** Important Update ******
I just realized that I forgot to mention something very important . . . The photographic plate doesn't just set in the hanger. When fabricating your hanger, design it so that it is necessary to spread the hanger legs apart in order to install a glass plate. It's the spring tension in the loop at the top (the handle) that allows the hooks to forcefully "grip" the plate. The plate should be gripped by the hanger with enough force to prevent it from moving or slipping. We definitely don't want any glass plates flying around the darkroom, or crashing into that lovely tile floor.