http://www.garagejournal.com/forum/showthread.php?t=176153
I have had this page open in a browser tab for some time. Saving in case I find myself with the time and parts to assemble one. Harbor Freight had a similar model with one additional feature I liked; the “pin” that held the stationary end of the work was actually about a 1″ square stock, which would rotate to pinch the work end against the circular jig as the bend was started.