Was that a LEM onto a Hardox disc you had running there?

What did you use as a disc and motor? The spinning ant I built used a CD drive motor from a PC which meant I had to carry a 9V battery on board if I wanted any decent speed/power. Then I took one of those round shiny discs from an old hard-drive, bolted some teeth to it, then fixed that to the motor shaft. Never took any videos of it though :sad: