Very cool looking machine! What does that machine do? I walked into NAPA and asked for a steering wheel spinner or a suicide knob. They said those were illegal for a car. So I told them I wanted to put it on my sewing machine and they found one but told me to ask for a tractor steering wheel spinner knob. Tractor supply also has them. BUT I saw one I thought I would mention. Someone welded an auger handle onto the clutch knob of an old industrial - the guy was sewing alligator hides with a treadle but he wanted the option of hand cranking it to get more torque. The advantage is you could remove the clutch knob and put another one on it.