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Brian:Is there air left in the system? It seems the volume would change as the piston moves unless the piston rod is double ended. Some air in the system, or an accumulator, would make up this difference. The pressure would change but still create a drag though the needle valve.I've thought of using something similar for motion. There air in the system would hamper motion so, I think, a double ended cylinder is needed.Yep, I have one of these on my bandsaw but didn't think about its operation.Thanks.Hugh