I made another hinged saddle square and this time I worked hard to center the holes on the "hinge". This one is a lot better but it's still just a bit off when you fold it over. I'll mark this one with the outside so that I use it in the orientation where it's accurate.
This one is made from some ebony I had in the shop. Figured it would hold up well in use.
Attachment 388012
Some years ago, I made a bunch of dovetail saddle markers out of maple. You can see what they look like here. Someone could make a regular saddle square the same way, attaching the two pieces of wood with dovetails.
Attachment 388020
Mike