Tired of that clunky Nail Knot and leader butt at the end of your fly line? 

1. Insert the 3-in-1 Nail Knot Pipe about one centimeter into the end of the fly line that connects to the leader.Proceed as follows:
2. Pierce the fly line with the tip of the 3-in-1 Nail Knot Pipe.
3. Slide the 3-in-1 Nail Knot Pipe through the one centimeter section of fly line so the needle eye is visible.
4. Insert the tippet end of your leader into the needle eye on the 3-in-1 Nail Knot Pipe. 
5. Reverse the 3-in-1 Nail Knot Pipe back out the end of the fly line and draw the tippet-end of the leader through the line so 2 to 3 inches of the butt section of the leader is sticking out of the hole you created in the fly line. 
6. Clip off the loop on the butt end of the leader, if there is one. 
7. Using a piece of sandpaper, gently sand the one inch section of the leader sticking out out of the end of the fly line. 
8. Mark the end of the sanded section of the leader with a Sharpie.
9. Apply a dab of Zap-a-Gap to the sanded section of the leader.
10. Pull the butt-end of the leader until the mark is even with the end of the fly line.
11. Clip the remaining butt section as close to the fly line as possible.
12. Apply a dab of Zap-a-gap to the hole in the fly line.
13. Allow one minute to dry.
14. Tie on your fly and GO FISH!