Now cut the tail off In my experience it has proven very well to: - let the body material end in the position of the hook point - and end with the bobtail where the arch is Following this instruction you get a rather small fly in comparison to the size of the hook. But as long as I fish these flies I got more hook-ups and lost quite less fish then before. And on the other hand it seams to me, that a larger hook doesn't bother the fish at all