Cliff;
Warren, Kaboom1 and I have made several hundred leaders using the above formulas. Kaboom1 and I also do a few of the fly fishing shows in the winter and sell hundreds on our leaders. It's exciting to have someone come up to our both and say "I bought one last year and Love it!!" then buy 3 -5 more!! Or, someone will drag a friend over and tell him "You've got to buy some of these!!" One customer asked if we could put a bit more oomph in to the thread leaders to handle bigger fly's. After laying up the thread leader we added a "V" of 2# mono and he was very pleased with the result. Lay up one of mono and add a "V" (peg 1 to peg 3 and back to peg 5) of Coats & Clarke "Glo in the Dark thread for night fishing!
I'm surprised that no one has responded to this post with one of their "Spread Sheets" that will let you make leaders for small trout, medium trout and large trout!! All I know is that ours work in most situations.