NEMA 17 & 23 Stepper Motor Turning Tool *UPDATE*

This tool requires a M3 x 20, M3 nut, a 3/8" X 1 1/2" bolt, 3/8" nut and washer. One crank fits NEMA17 and the other fits NEMA 23. The knob was derived from this great design: http://www.thingiverse.com/thing:17740. I made the crank.
I initially wondered why my Shapeoko 2 motors had a dual shaft. I found it was actually useful if you need to position the Z axis when the machine is not powered up. This crank takes advantage of that second shaft.

****UPDATE****
http://youtu.be/6VvwGsz