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Rigging screws and turnbuckles, also known as straining screws or bottlescrews, are a simple piece of equipment used to adjust the tension of wires and ropes or to secure loads.

Rigging screw and turnbuckle are interchangeable terms, commonly the term rigging screw refers to a fitting with an enclosed body hiding the threaded section, whereas a turnbuckle will have an open body, exposing ...