Question about casting a foot with large FF supinatus?

Thanks for the reply. Much appreciated.
However, when trying to treat a fully compensated or uncompensated forefoot varus.................does it matter if the forefoot post is intrinsic or extrinsic? aren't they one and the same thing? One is just intrinsically posted and the other is extrinsically posted, right? or am i wrong? I guess thats what im trying to figure out.
Any help would be much appreciated!
Cheers,

 

Intrinsic forefoot posting is most effective while the rearfoot is on the ground, after heel raise, the forefoot varus is on its own, not so with the extrinsic forefoot post. I find it a little harder to fit in a shoe and it takes a little longer for the patients to get used to it but more effective. What I haven't tried is a combination of the two, does anyone do this?