My T track is free to pivot up/down. The track is bolted to alloy rod with 3/16" machine screws. The rods are attached to the main beam via "T"-shaped stainless fitting rivetted to the beam. The rods have slots cut to fit over the "T" fittings, held on with a pin:


Better view of one of the "T" fittings at the main beam (also a nice shot of my snazzy spin halyard cleat system):