I just saw a automated coffin on YouTube, where the guy made the lid fly open with the help of a motion detector. What I found interesting was he made a couple of pneumatic actuators out of standard ole screen door closer's. by taping the ends hooking up some tubing and running air to them. Has anyone done this or have a link showing how to make one, I looked around (sorta) on YouTube but really didn't find anything. I would like to try another little project if I can figure out how it was made.