The Triple Surgeon’s Knot
Use this simple knot to join two lines that are similar in diameter. Do not use it with so-called superbraid lines or the knot will slip.
Step 1: Overlap 8 inches of standing line with the section to be added. Form a loop with both and pinch the intersection between your left thumb and index finger.
Step 2: Using your right hand, pass the standing portion of the tippet and the tag end of the main line together through the loop three times.
Step 3: Moisten with saliva, then pull EVENLY on all strands. Before trimming, pull on the individual strands to make sure each is drawn up tightly.