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The stud wrench structure is shown in the figure. It consists of a T-wrench 1, a Hexagonal tube 2, a slotted screw 3, a ball 4 and a half-hex nut 5, 6. The left and right halves of the hex nuts 5, 6 together are a complete hexagonal blind hole nut. The steel ball 4 is used to reduce the friction between the top of the bolt and the top of the blind hole nut when tightened. Due to the stud bolt 7 in the blind hole snail
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