Finally constructed a device that can apply a rotating skin stretch to a person's arm. It is simply a motor attached to a pulley system that applies the rotational skin stretch. The skin stretch tactor has two points of contact, approximately 15 mm apart from each other. The device seems to work alright, I can vary the torque by changing the current, doing some non-scientific measuring the of the force required to turn the stretching device, 1 amp provides about 5-6 Newtons of force at the point of skin contact, which was about the correct amount we were hoping for. 5-6 Newtons of force was right on the borderline of our "med" and "high" force tests, where medium was about 5 N and high was about 7 N.

But the pulley system needs some work/refinement. The tensioning isn't right using the shape I cut out of the disc, but we can just try another.