I'm familiar with one-way truss rod and I adjust it with confidence. The double action truss rod, seems to me, works adding either bow (clockwise) or relief (counterclockwise).
I'd like to know a bit more about it since even my tech isn't familiar with this kind of truss rod. Only generic informations, not related to my guitar, or perhaps a link that have these informations.
Anyway thanks for the attention; it's very kind of You considerating that I'm not speaking of Avalon in the Avalon forum.