I just inherited a bunch of my fathers slides. They are in straight trays that are marked were N0.1 so I assumed they were for the Kodak Cavevade projectors. It turns out they were for a Wolensak projector. I purchased a 510 Cavecade for $65 total but it looks like it's missing a part. I'm wondering if someone who has one can take a photo so I can see if I can fabricate something. Looks like the brass part iwith the groove in my photo should have a spring, a clip, or something that keeps the sliding frame in the channels.