Jay, Lefty Kreh show me that loop it's also in his knot book w Mark Sosin. He's says he has never had one of the "whipped loops" fail.
Goerge Harvey actually designed his leaders around the loop Alra is using. He uses a 12 inch piece of mono and incorporats it into his leader formula's. They can be found in George's book or Joe Humphrie's
"Trout Tatics".