Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Kidd6488-at-aol-dot-com> hi all, I'm not sure if this aplies to the PTs but it does for MOTs, go to <http://www.altair-dot-org/tesla.htm> and scroll down to Extending MOT stacks and look at the two pics Jonathon Reinhart