Scaffold
The Scaffold Knot makes a sturdy loop that slides like a noose to fit snugly around a bar, rail or other object. It may be protected against wear due to chafing by the insertion of a lining called a thimble, creating what sailors refer to as a "hard eye". Thimbles come in a range of sizes and are obtainable from boat and yacht chandlers. The Scaffold Knot is similar to the Poacher's Knot but it has an extra turn. It is sometimes called a Triple Overhand Noose, whereas the Poacher's is sometimes called a Double, or Two-Turn, Scaffold. Another simple sliding noose can be made with the Slip Knot. Note: never play "hangman" with this or any noose knot, they can kill.
Fishing Knots
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