I'm surprised that there isn't some kind of locking mechanism on view camera backs. The spring has to be firm enough to hold the film holder secure, but not so firm that you can't open it.
My Sinar backs have a "bail" - a lever - which allows the spring to be tighter. Even so, I still have to keep my thumb tightly on the film.
I guess it's time to find a simple clamp of some kind. I've started a new thread to see if others have invented something.
Bookmarks