[MichaelBick]

We prefer flat belt polycord because it's much quicker, faster, and lighter to make rollers. What we did last year is we got 1.25" OD 1.125" ID aluminum tube, and just cutoff at whatever length we needed. Bearings just press in and you can make hubs if needed. No need to groove either. You just wrap electrical tape where you want the polycord and the belt walks back into place if it ever moves. Also, it allows for a smaller gearbox ratio which further saves weight.