Page 150 - Maria Constantino "The Knot Handbook"

Complete four or five turns
4 around the main rope.
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Tighten the turns and
5 bring the working bight
down to the tail of the sling.

Tuck the tail of the sling
6 through the working bight.
To lock the knot in position,
puU downwards on the tail of
the sling.