Quote Originally Posted by David A. Goldfarb
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You could also cannibalize an old 8x10" wooden holder for the light trap...
Forgot to mention the plate holder will be designed as a square with a cross-like arrangement to hold plates either vertically or horizontally so I need to have the baffle width exceed the 8.5" dimension by about an inch total. That rules out grabbing a spring from an 8x10 holder (I think) and I don't really want to cannabalize one of my 11x14 holders for this.

I do have a old 11x14 Graflex film holder that I've taken apart at the darkslide light baffle and it looks like a very thin piece of spring steel (0.025"?) is in there covered by felt. I found some spring steel at McMaster-Carr so maybe I'll buy a piece of that and see how it works.

Joe