Page 116 - Patrick Moreau - Marine Knots How to Tie 40 Essential Knots
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1 - If the ends to be tied are of different sizes, create a loop with the thicker rope.
You can also use an eye that has already been created with a knot or a splice.
2 - The other strand is led into this loop from bottom to top.
Then it passes under the whole structure to come back and finish its path by being tightened on itself.