I've tied flies for about 9 years and have started adding the science to the art to get not only realistic looking flies, but also realistic acting flies. Recently I went fishing with a friend and found while we were both catching lots of fish, he was doing slightly better using beadheads versus my same designs without the beadheads. As a result, I would like to try tying some beadheads, but am not sure how to tie them on. Should I cement them on and then tie them on, or just build up the thread on the aft side of the bead?