As referenced above
the Pollmann had that plug and it was interesting. On at least on occasion the endpin came loose or fell out entirely. I fixed it for good with a thin sandpaper shim.
Two holes in the Block does worry me as well. That bass however was very loud and carried better than my Martini, one other bass (forgot which?) and a Hawkes 'H' model bass. With a friend and myself we did a blindfold test each playing all 4 basses and listening 2 rooms away in my shop about 50 feet away. That Pollmann won both times. It was fairly new and up-close, sounded new tone-wise but I wondered if the separate Tail plug had anything to do with the volume and carry power.
Maybe someone here could contact Pollmann and ask why they do it?