I used to try figure eighting rubber legs in but it seems easier to just lay the legs right on top of the hook parallel with it, make a loose wrap or two to hold them in place a bit, then tighten the thread up and pull the legs into position on the sides of the fly. Might not be the look your going for but it makes adding legs easy for me. Each strand of rubber gives you two legs on one side of the fly. I'm not sure if this is clear or not so if you can't picture it let me know and I'll try to post some pictures later today or tomorrow some time.