This is actually a wire connection issue I don't understand: how to connect the wires to the two TT track power terminals. At each terminal there appears to me to be a very small Phillips screw with an open space beneath. I grabbed a very small Phillips screwdriver which went straight through the screw stopping at the layout top. I attempted to feed the wire up through the hollow screw and then tighten the screw. No dice. Screw did not tighten. Owners instructions were of no help.
For reference, this is the newer "improved" O version. What am I not seeing? I have never seen this type, whatever it's called, of electric connection.
I would greatly appreciate some enlightenment