This is my first attempt at a pneumatic prop. I used an old weight bench as a frame to mount the cylinder and the chair. The frame for the man was made from 3/4 pvc. The cylinder is a Clippard double acting with a 30" stroke. I have a 5-way solenoid valve that controls air to the cylinder. A remote control relay with keychain remote activates the prop. I also have a DEI timer relay and two bosch relays. The sound is done with a Cowlacious car/p 300 recorder player. The head is by Brian Wright. (I added the eyes and did a little detail work on the teeth.) I have an LED light mounted to the back of the knife to provide an uplight to the face.