At a train show this past weekend I was looking at this jig. Neither I nor the guy running the table knew what it was for, so he said, "Just take it."
It is 24" long, the lower wood "runner" is fixed and the other is moveable and can lock down with the wing nuts. The gap between the runners can be 0 to 7/8"
So anyone know what this is for? Guesses are welcome.
BTW - 3 people stopped me at the train show and asked what it is. With the 3rd guy, I answered "A conversation starter."
Bob