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This is one I built some time ago, I used an air cylinder for a dump truck tail gate and the pipe is 3'' exhaust for a car.I also put exhaust regulators on the valve to help save the fingers(you can adjust tem to control the speed of the cylinder).It`s super simple and doesn`t take long to build.
I like that air operated one. So many of them are lever action where you have to put the can in and take it out. Easier to set them in a line on my back sidewalk and just stomp on them. If you could rig up a feeder for the air operated one, that would be the ticket! Load a bunch of them into the hopper and then run through them!