Surgeon’s loop

A loop at the end in three seconds, for a quick-change leader.

Tying it

1. 1

   Step 1: Fold the end of the line back to form a double strand.

2. 2

   Step 2: Tie a double overhand knot with that doubled line.

3. 3

   Step 3: Wet, tighten by pulling the loop and the standing line, then trim.

Always wet a knot before tightening it: dry friction burns the line and costs a good part of its strength.