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I can almost gaurantee the shaft will bend after 1 good hit
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try this: flip the piston upside down. make a mounting bracket to connect it to a piece of extruded aluminum so the aluminum is flush with the back of the piston when the piston is extended. have the piston retract to pull the extruded alumiinum bar down, pushing the suction cups onto the ground. that way, the piston rod is inside your bot when you're taking the force, and wont bend nearly as easily if you take a hit. other than that, not too shabby.