Hi, Although the standard motor position is simple, easy, compact and visually neat....from a strictly performance perspective it leaves alot to be desired. So I thought....why have short belts between stepper and shaft...why not put the motor...ON the shaft. Thus eliminating both short belts, two pulleys, and the compounded positional error of two rubber belts in series. So it just uses 2x flexible shaft couplers (5mm/8mm, with nice clamping bolts instead of horrid grub screws...YUK !)