One of my students arrived early for his lesson, so I showed him the project on my workbench. I was just at the point of measuring where to put the bridge on an old department-store guitar which I was converting from tailpiece to pin-bridge. I explained why this is critical for intonation, and that you only get one chance on a flat-top, unlike an archtop.
John (my student) is a carpenter, and enjoys solving problems, as I have seen in his guitar lessons. With only a moment's thought, he suggested the set-up show in this photo, and asked, "Would that work?" I said, "I can't see why it wouldn't work." We then had the conversation about how, if this is a good way of doing it, someone else must have already thought of it.
So, I used this method to locate the bridge, glued it in place, did all that other silly stuff involving a nut and saddle and strung it up. It intonates perfectly.
My question: did John and I re-invent a wheel? Or did a carpenter and a VERY inexperienced luthier come up with something new and useful?