I am in a robotics competition where we can only use certain parts. My team built a scissor lift, and we are currently looking for a better way to lift it. It takes upwards of 100 pounds of force to lift, and when it's down its base is about 3" by 10". I want to build a pneumatic cylinder, but it will be difficult. The rules state: We can also use PVC cement and surgical tubing. Does anyone have an idea of how to do this? Especially difficult will be making a sliding mechanism that doesn't leak, compressing the cylinder, and getting it to create so much force will be especially difficult. Right now, I have at least a rough idea of how to make the cylinder, but no idea how to compress it. We cannot use regular compressed air cylinders in the competition, but I suppose I could store air in a sealed PVC pipe or build a compressor to put on the robot. Thanks for your help!