Ole, Is it a kind of smart, universal, way on lens mounting to lens board? If it is than can You put a bigger picture of the center part with it?
Here's a different one, without a lens in it. That makes it a little easier to see what it is. This one's a bit bigger though, so it won't fit on a Speed Graphic lens board. It sits on a Sinar board now, for use on a Gandolfi 8x10":