17_go bar deck.jpg
This device is called a Go Bar deck. I believe it is a Japanese woodworking concept which allows one to glue many braces at once. The braces are held in place on the top by wedging a stick (in this case a fiberglass rod) in between to very stiff plates. The plates are held together with threaded pipe. The bottom surface is radiused workboard that matches the radius cut into the braces.