David, on the device I'm using I noticed on the packaging that V(in) was written at both the center pin and at the top next to the screw terminal. Using an ohm meter I confirmed they were in common. The package included a clear plastic insulator for the back side and a plastic isolation spacer for the screw. Also, the thermal conductive paste is always a good idea.
Again, unsure if all this is needed for the positive regulator.
