Here's the first pickup coil built and my winder. I built the winder as a clone of the Scratten winder after someone posted a picture of the guts of the Scratten winder on another forum. Dead simple to build. A box, 2 bearings, drill rod, a PCB speed controller kit for $12, a 5$ motor, a used Ebay battery powered counter, an on/off switch and a $4 reed switch.