I have a variation but the best model I could point you to is the one that Andrew Moy ties over at Tightlines Flyshop, our sponsor in Pinebrook New Jersey.
If you can't get hold of him let me know and I will prepare a recipe for the archive.
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum