I am looking for ideas on how to couple a stepper motor shaft to a threaded rod for a CNC setup. The motor shaft is 5mm, and the threadedrod is #10 (4.8mm). Short of machining an aluminum rod with a setscrew, is there any off the shelf items for this application? I have scouted the hardware store shelves but could not come up with anything. I would appreciate any input on this. Thank you.