I built this beadroller after seeing a number of designs on YouTube. I used a motor with a little more power and a heavier gearbox because, well... you don't want to not be able to work with some heavier gauge metal if the need arises. I also made all the dies on my lathe and milling machine. I used a 1" diameter shaft with a hexagonal end drive for the hubs I bought. I liked this design better than using keyways. The pedal controls the variable speed motor control so that I can vary the speed of rotation from a dead stop up to a speed which is as fast as I would want to go. I'm using this primarily for making metal embossed signs and also some rocker panels for vehicles. The upper shaft is adjustable laterally 2 inches and it is easy to have both shafts driving or to only use one when the dies are different diameters.