| 摘要 |
A safety mechanism includes multiple positioning recesses defined in a bottom face of the head of the adjusting sleeve, a stop received in one of the positioning recesses, a slot defined in a top face of the body, an urging spring received in the slot, and a urging ball partially received in the slot and urged by the urging spring. Therefore, rotation of the adjusting sleeve relative to the body is limited due to engagement between the urging ball and the stop which is received in one of the positioning recesses and separation between the adjusting sleeve and the body is avoided.
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