I have your answer... look for a fly called the rattle snake, can be as long as you want, is articulated so you have tons of action, deer hair head so moves water, and has beeds that rattle and click together for noise. If that doesn't do the trick I don't know what to tell you. If you have any trouble finding it or can't access the site I'm going to link you to just PM me and I'll send you a couple.
http://p068.ezboard.com/ftrouttalkfr...picID=90.topic
I use small beads from the craft store and only use 3-4 and use spider wire to link the two hooks, if I use just two small beads and make a bigger deer hair head it will almost susspend, making the big bass around here loose all control of themselves. or if I'm fishing musky down deep I use 5-6 beads and a sinking line to dredge the bottom. I have tied a few that were close to 7 maybe 8 inches long but rarely use them since I don't chase musky as much as I need to.
Steve