Unless you play guitar, you probably have never heard of a Fender Thin. If you are not a guitar connoisseur, it is a guitar pick. Now why on earth would someone that shoots LF and ULF be interested in a guitar pick, you ask?
Ever try to unload a sheet film holder while wearing Nitrile gloves? Or ever had a sheet of film that has a slight rearward curl. Then you know how difficult it is sometimes to get your finger under the sheet to remove it from the film holder. Now do you see the value of a thin guitar pick?
I keep a small container of thin guitar picks near the back of the enlarger baseboard where I normally unload film. I can locate my stash of picks in the dark and they are invaluable sometimes to get that stubborn sheet of film coaxed out of the film holder without excessive handling or damage. A thin guitar pick can easily be slipped under the film to allow you to get your finger under the film edge.
The next time you see a music store, stop in and purchase a few thin guitar picks. They could save you a lot of frustration. Who knows, you might want to take up the guitar!