Yes Ian, there are several ways of tying the mosely. Some use the figure of 8 method....under the fly and then over behind the hackle to lift the hackles on the underside. Others (Saracen) just tie a heavier hackle on and then cut the underside.
I prefer to tie in a piece of nymph skin 2-3mm wide depending on the size of the fly or someting in the same colour as the body in a plastic/durable material on the underside of the hook behind the hackle. Once I finish winding on the head hackle I pull the material towards the eye on the undderside of the body and then tie it off. This will split and push the hackles to the side the same as the figure of 8 or cutting would.
Hope this helps.
Dibbler