Page 42 - Peter Randall "The Craft of the Knot.."

You can make a bend more secure by tying down the running ends.
Backing Up is a good method for bends like the Surgeon’s Bend, where
running ends exit parallel to the standing parts.

Tie down the running ends of a Surgeon’s Bend (see further) with a
Half Hitch (see Chapter 4) on each side.

This extra tie-off can also be an Overhand Knot. When you make
bends with climbing rope, you may also consider using Triple Overhand
Knots (see Chapter 1) as a backup—the extra tie-off will make the knot
safer and will keep the running ends of the knot from waving around.

BOWLINE BEND

If it happens that two ropes that need to be joined are greatly dissimilar
in size or material—or both—a bend may not be a safe and secure
solution. Instead, what you can do is join the two ropes by forming two

loops. If a loop is tied in one end, and a loop is tied in the other end so
that it passes through the first one, then together they make a bend. If
both loops are Bowlines, then the result is called a Bowline Bend.

Here are two interlocking Bowline Loops.

BUTTERFLY BEND

Also called the Straight Bend, this knot has the same form as the