I have a brass petzval lens that I've used on a speed graphic and want to start using it on my Wista 45DX (which takes Linhof boards). Ya, I need a shutter or an ND filter to get > 1 sec exposures and that's fine. The bigger problem is the brass lens is larger than a copal 3 hole. I don't want to try to file an aluminum board so I'm wondering if anyone has some across a plastic board that would be easier to modify (file/sand).

If you have a reference to an online seller, that would really help out.

Cheers, Don