This is another great and very strong loop knot.  The non-slipping loop allows your fly to move freely and adds just a little more action than a traditional clinch type knot.  This knot is extremely useful on heavy shock tippet.

1. Tie an overhand knot in the line.
2. Thread the tag through the eye of the fly and then back through the original overhand knot.
3. Tie a second overhand knot in the tag end around the main line above the original overhand knot.
4. Pull everything into place, working the knot into position depending on how big you want the final loop to be.  Use saliva to lubricate the knot as it is tightened.
5. Once the knot is tight and secure, trim the tag end.

Illustrations by Greg Pearson