I need a bit of help figuring out exactly what kind of lens board this thing accepts; at first sight I thought it was a Technika adapter but the central hole is the wrong size and the spring clips - here removed - are the wrong thickness; a Technika board doesn't seem to fit it at all. I've been looking at pictures online for a couple days and I haven't found anything that seems to match it. The recessed grooves are 3.865" apart (outside edge to outside edge), the central hole is 2.965" in diameter, and the spacers for the retainter clips on either side are .120" thick and were spaced exactly 4.000" apart. I'm sure someone knows exactly what fits it, but that someone isn't me; apologies for the horrid picture...I had to prop the board on a film canister in order to get the weird groove in the surface to show up.
Pictured: With my luck, whatever fits this will be more expensive than Cambo boards.