Does anyone have a roll film back mask that I can print and cut out (maybe in PDF form) for a 4x5 ground glass? Figured asking first might save some time, before I start to make one from scratch.
If you want tight tolerances it's probably safer to measure the opening on your own back and create the mask yourself, I have two 6x9 backs that are offset from each other by a mm or two.
When I had a Linhof TK45 I simply marked the corners of 6x7 on the ground glass to match my 67 roll film back. The gg had grid marks so it was simply a matter of knowing where the corners were.