Well....You know.....I am thinking of buying a broken 3 1/4" X 4 1/4" double dark film holder that is broken on ebay for 8 bucks for research.

Somehow at this time I don't see much point in investing 8 bucks for this broken film holder to use for research to produce the "304" film back.

Perhaps you folks on this forum could show a bit more enthusiasm toward a project like this???