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We have had good experances with set screws on flattend shafts, we actually had this setup on a vandoor at full stall and it never came loose.
But I would get some 1/2" steel and make an coupler before I would buy one. Its really not that hard to do if you think about how its made.
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Justin Stiltner
Lead Robot Inspector, VCU Regional
Unmanned Systems Lab, Virginia Tech
KI4URQ
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