Page 188 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

12. Stopper Knot

This specific stopper knot is named the Stopper Knot. It will stop a hole

bigger than an Overhand or Figure 8 Knot, makes an attractive and
comfortable “handle” at the end of a rope, and adds enough weight so that
the end of the rope can be thrown.

Uses: stopper, handhold, heaving line
Pros: large, comfortable, attractive; easy to tie

Cons: only works well in rope of medium diameters; more time-consuming than other stopper knots;
cannot be made as large or heavy as the Heaving Line Knot; kinks can make it awkward to untie

Instructions

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