Jack,

Are you thinking of getting something like the PT-3 dual pier column that Pier-tech sells?  I know you mentioned Pier-Tech previously but looking for another source as it is expensive.  I must say, if you are looking for this design, the one I got from Pier-Tech, albeit expensive, has worked like a charm for almost 2 years now with my AP1100, C11" and now 80mm piggybacked on top.  Vito is always available and everything is under warranty.  It makes me sleep better at night.

Bruce