Parametric pulley with studs for slip ring for use in POV display

I customized this great parametric pulley by **droftarts** with mounting studs for an electrical slip ring from Sparkfun.com. There is also a small hole for a magnet to be sensed by a hall effect sensor. Paired with a smaller pulley and belt, this powered a 1 meter POV display.

Slip ring:
https://www.sparkfun.com/products/13064