Two limit switches are installed on the frame to control the reversal valve to change the movement direction of the rubber knife, at the same time it protects the cover of the cylinder.

The presence of the knife near the rubber arm caused the participant to flinch, and monitors on the left hand indicated a similar stress response as when the real hand was targeted.

Using a pencil, trace your stencils and use an x-acto knife to slowly cut out the design. or, we used our rubber stamp collection to stamp on the bags in white, let dry and cut around the stamp.