Been a long time since I watched them, so It's possible that I'm mistaken, but sure seemed like I saw one with him tapping forearms. I remember him talking about how It really pumps the forearms up.
Yeah, The tenon threader does male threads not female. Similar in the way It works though the tap would be mounted in the tail stock of his lathe with the set/lock down screw on It set to let the tap draw into the piece as You turn the headstock. You can do It By letting the whole tail stock slide with the tap too, but I prefer to let the quill of the tail stock (thing thing that the drill chuck mounts to) move, and I just reset/reposition the tail stock before it maxes out and tears the threads out. I do the same when backing the tap out. I prefer to turn the work piece by hand instead of powering the lathe for this operation. Much safer, and easier to control IMO.
If for some reason You back the tap all the way out and need to restart It. Turning the work piece in the opposite direction with very very lite pressure until You feel the tap drop into the threads, helps to get It lined back up, and restart the tap without chewing up or ripping the current threads out. This is all with a Hightower or Taig tail stock. A little more difficult to do what I explain with a heavy tail stock on a metal lathe, because the quill on the tail stock does not usually slide freely, most are fed by turning a handle on the back. It can still be done though. Just that I would use a different method on the metal lathe.