The secondary coil is made from 4 inch PVC pipe, 26 inches long, and wound for 23.5 inches
with 22 AWG red enameled magnet wire. It was covered with 5 coats of polyurethane. The top
cap was also made from a PVC level-fit closet flange with the outside section for the bolt slots
ground away. I also drilled a hole to fit a 1.5 inch piece of PVC which a section of smaller PVC
fits inside to hold the toroid.