I've made about 4 sets over the years - I made them out of scrap sheet steel, making up patterns in cardboard to get the lengths right, cut out the dumbell-like shape, did all my bevels, screw holes, taps, etc. before bending. I made up a little bending guide out of steel that was the width of the strap that would be installed. Bent the ends to receive the screw at a 90-degree angle before any of the other bends, then basically wrapped the piece around the steel mandrel, and was done. Pretty easy.