I've just started looking into the possibilities for pulleys for the ball screws and stepper motors.

I understand HTD belts have been recommended, but my problem concerns the spindle on the motor I'm considering, it's Dia 8mm x 21mm long approx. I don’t really want to use a belt less than 15mm wide but can't find a pulley to fit the length of the motor shaft.

What has been used before, any ideas?