Has anyone made a large split back contact frame?

[Tin Can]

2 different animals

Split back, holds registration while peeking at exposure process

a vacuum frame usually does not

[DannyTreacy]

Thanks for the replies all, very helpful.

[Vaughn]

A general search for "graphic arts equipment" might be a start. Photographer's Formulary in the USA has large spring-back contact frames for sale, as well. But I've never used one larger than 11x14" so can't comment about how well such a large frame would work.

Not good frames for larger sizes (from experience). No pressure in the center.