That bar you have, is it rotating from left to right or up and over? Rotating it from left to right like Arefin says with a turret is mechanically feasible and pretty easy to set up.
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If it's mechanically feasible and not overly complex, how weak would the rotating horizontal part become? Would it be able to sustain a good amount of vertical force without falling apart (breaking) or malfunctioning?
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You can make an arm pretty beefy depending on what access you have to materials and machines. Usually for us its more difficult to stay under weight than have things tough enough.