Tying foam flies

I have tied trout flies for many years and am still tying them for my friends, My age has stopped me from fishing for trout, {can't wade any more.) I have acsess t/o a lake full of bass and brim and am trying to tie some foam flies. I am having trouble keeping the foam from rolling arououd the hook. I think that I may have a soulution. I am using scrap from legs pieces to tie along the top of the hook shank where the foam is tied in. I can tie the scrap tightly and it won't roll. Foam tied over the rubber won't either. You guys maybe have a better idea.