I'm a long time lurker and first time poster to APUG. I'd like to present a webpage I've created for making your own vacuum film holder; the text and accompying photographs are a bit too lengthy to post here. I designed my holder for a 4x5 camera, however the design could be easily adapted to larger formats (for you folks who have film falling out of 8x10 holders!).
The page can be seen here: www.deadbread.com/crumbs/vac.html
I've been working on this project for some time, and comments or suggestions (improvements?) would be greatly appreciated.