I used a combination of phantasmechanics instructions
The Flying Crank Ghost - Instructions, Part 1
and Kick the fogs. My motor is an outdoor barbecue rotisserie motor I picked up at a thrift sale for 3 bucks. I have since found 2 more at yard sales, one battery operated. Start looking now, and ASK if they have one!
With its red LED eyes, eerie blue glow and slow deliberate motion it really is one of the most impressive looking props - people are always amazed by it. Go for it and good luck!