Hard to explain sometimes when I hardly know what I'm trying to
explain

The knurled couplers - one coming from the tm the metal collar itself
shows a circuit to the metal parts of the tm head.

The other knurled part, the end of the adapter cable, is soldered to the
nekkid wire in the adapter cable.

The nekkid wire runs the length of the adapter cable, then apparently
just dead ends up close to the plug on the other end???

It does not have a circuit with any of the three pins on that end, and there
are no metal parts on that end, all plastic.

So it looks to me they have a nekkid wire basically just running inside the
sheath from the tm foot all the way to the back of the df, but not hooked
to anything on that end. And that's my story and I'm sticking to it.