Hi Allan....... depends on the fly....a Klinkhammer or emerger that I want to ride low, I would tie it off under the hackle on the post. For a dun imitation, I would tie it off on top of the post. Since that isn't one of the choices, I'd probably still tie it off under the hackle because it's just easier for me and the fly looks better. Why isn't on top of the post a choice? Just curious......Jason