Page 405 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

3. To tighten, pull both parts of the bight with one hand, and the standing parts of both thinner ropes with
the other. If a tucked finish is desired, the two thinner ropes may be brought forward and passed through
their own crossing turn from back to front, so that all three working ends face the same direction.

Untying: Pull the working ends of the thinner ropes out from under the

parallel crossing turns.

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