Marc Defrank has a tip on how to create the angled/bent rubber legs. I have not seen this before and have not tried it. Check it out and also note a nice photo S-B-S on how to use a whip finisher in another post by Defrank.
Beginning Fly tying, fly tying, fly tying materials
Fly Tying: Bent Rubber Legs (How To)
SwittersB & Exploring 
Great trick. Can’t wait to try it.
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