Everybody’s favorite slingshot aficionado, Jörg Sprave, is at it again. Got an old set of steak knives sitting around the house collecting dust? Why not turn them into a battery-powered whirligig of doom? Using a battery powered drill, some MDF, and a timing belt, Jörg constructed one mean looking rotary slicer. Seems like a great stress reliever. If you get bored of the steak knives, you could always swap it out for a buffing wheel and wax your car.