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If you are using this to both launch and stack boxes (extend halfway to stack, extend fully to launch) you could take a different approach to stacking. The way we are planning to do this is to have a screw-jack under the arm we"re launching the boxes with, so we can lift the arms slowly and thus either stack boxes or run around with a box before launching it. We are then going to use a piston to launch it, but we won"t need to have the piston have two actuated positions.
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