How much should the screw pin of a shackle be tightened during rigging setup?

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The correct approach for tightening the screw pin of a shackle during rigging setup is to back it off 1/2 turn after tightening it all the way. This practice allows the shackle pin to seat properly while also ensuring that the pin does not come loose during use due to vibration or load shifts.

Tightening the pin all the way can risk over-torquing and binding, which may lead to difficulty in removing the pin later. Conversely, backing it off too little may not provide the necessary adjustment for safe operation, increasing the risk of the pin loosening or disconnecting when under load.

Therefore, backing off by the recommended amount—1/2 turn—balance secure fastening while also considering safety and ease of future maintenance.

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