Last year was my first pneumatic bucky pop up. I used the screen door cylinder with the solenoid on a motion sensor with the air compressor. The frame was wood. The main problem was it was wobbly. And really fast and jerky when it went back down after the sensor timed out and released the unit. (sorry if the terminology is not right, but I figure if you can help than you know what I mean). So I was thinking about getting a new screen door cylinder and tapping threads into it for the hose. Then I want to build a different frame or rig. I was thinking about the 4 pole or 4 stick (terminology) system because it seems to be less jerky and you get more travel of the figure. So can any one lead me to a good but nor giant build? I was thinking about another bucky or a home made ghost about that size that pops through some bushes. Thanks.