Here's the basic hinge welded together and ready to fit. They chose 1-inch chrome-moly tubing for light weight as well as overall size so the hinge would look trick but subtle when finished. Louie bent two equal left and right side pieces with 110 degrees of arc. He had a tube bender, but a home shop can get the same results by simply filling the tubing with sand and then torch-heating it to bend over a round surface if need be. He cut a straight length determined for the application, cut one end of both the bent section and straight piece at 45 degrees, and then welded them together while clamped. The bushing ends are 1 inch long. The other end of the straight tubing section was notched with their joint jigger tool on the drill press using a bimetal 1-inch cutter. Louie then welded it all in place.