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Benjamin air pump ebay items 
$72 for the control valve it was $68 for the pneumatic piston and the 2 British fitting for air cylinder $20 the alum was in my shop and I have a compressor already the rest of the fittings and stuff laying around where I work FREE. I tried a video but couldn't get it off my iphone. So I took still pictures I will make a video with my camera an post latter. The first pneumatic piston was not big enough I did the math wrong for the amount of force that I was guessing that it would need so this cylinder I went over the pounds of force ratio and it works like a charm