Knots for Fly-Fishers
More and more, fly-fishers are using braided leaders or braided leader attachments with end loops. One advantage of using a loop-to-loop connection is the ease of changing leaders for different situations. This connection can also be used to connect a leader to a tippet with a looped end. Loops can be formed at the end of a tippet, leader, or line with many knots, including the Surgeon's Loop, Nail Knot, and Uni-Knot. I recommend a Uni-Knot for its slim, smooth design.
If you connect a nine-foot, 4X leader for nymphing and want to switch to small dry flies, a 4X leader will not do the trick. Most leaders have built-in loops, and if you have a loop connector (usually a braided leader) on the end of your line, changing leaders is quick and easy. Simply remove the leader by backing out of the loop and you are able to attach a thinner leader. Connecting a braided leader with a loop to a leader with a loop forms a knot that retains virtually all of its strength.
Hold the fly line in your left hand, the leader in your right. Thread the end loop of the fly line through the end loop of the leader.
Thread the other end of the leader through the fly line loop.
Pull both lines in opposite directions and tighten the knot. This should look like a square knot if you have done it correctly.
Details mentioned in this article were accurate at the time of publication