1 The magnet originally had jagged ends and severe surface rust. Here it is after a session with Mr. Rotary Tool. I then sprayed it with black Rustoleum appliance enamel.
2 Magnet end view. The I-beam is magnetized “across the bar”; one flange is North, the other South. I think some would call this orientation “wrong”, with magnetic flux flowing mostly parallel to the strings.
3 Magnet was charged with this torture device. Stacks of 3/8”D x 1/16” neo magnets on the jaws are contained by holders made from tomato cans.
4 Bare and white lead wires anchored to magnet; magnet covered with clear plastic and white cloth tapes; coil Start soldered to white lead. Bare lead contacts bare magnet, coated with Ox-Gard; white lead is insulated from magnet by clear tape.
5 Grammar school science project, with no help from parents. Wary of spinning a huge hunk of metal, attached by carpet tape to a sewing machine or hand drill, I built this contraption from scrap and surplus. Coil DCR initially read 612 ohms, but dropped as low as 598 ohms over a few days. (Resistance drop as wire spread out and "settled in"? Meter inaccuracy?)
6 Coil winder construction detail: Faceplate magnet holders were molded from Sculpey.