Page 154 - Peter Randall "The Craft of the Knot.."

STEP 2 Continue these wraps, following the natural spiral shape of the
strands, all the way around the circle. At this point, it should look like a
ring of three-strand rope with one strand missing.

STEP 3 Now use the other end to fill in the place of the missing strand.
Twisting it slightly as you go may help it seat better. Finish by tying the

two ends in a Half Knot, just as you would in the first part of a Reef Knot
(see Chapter 6), and then tuck the ends over and under the strands in
the manner of the Back Splice (see Chapter 1).

Making Rope Grommets can help you better understand the structure
of three-strand rope. Because synthetic rope tends to forget its shape

when unlayed, it is awkward to use for making a Grommet.