(Duncan Loop, Uni Knot, Grinner Knot) One of the most important snelling knots, used mainly for attaching hooks, swivels, lures or flies to a line. It can also be used for joining two lines. The knot is very strong and dependable and not complicated in structure: after some practice it can be tied effortlessly in the dark. The knot was named after its inventor, Norman Duncan, but then for its vast scope of application it got another name — «uni knot». Among the multiple virtues of the Duncan knot is that it can be tied at some distance from an object and then it slides into the right place. The knot is not recommended for braided lines; it is more secure on monofilaments.
Thread the rope through the eye of the hook from behind.
Cross the running end over itself and over the standing part to form a loop.
Pass the running end around itself and the standing part from behind 4-5 times.
Pull the running end out of the loop.
Tighten the knot. Pull the standing part to adjust the position of the knot.