psarkissian: Thanks for taking those questions. I've attached images for your consideration.
There is a cutout in the guard for nut access, but it's not large enough actually navigate through with a hex wrench. More of a peephole than a useful access hole.
Fretwork is "ok", but has required that I level, dress and polish them. It plays much better now, as there were high frets in places.
I agree, then, that "something must be wrong." It ranges in motion from tight position (clockwise turns to achieve moderate resistance) to UNSCREWED from rod with counterclockwise motion.
Removed battery box as requested (see pics)
Again, I really appreciate your questions. Sounds like I got a bit snowed by the seller. Since there was a refret, Perhaps the luthier removed the fretboard and changed out the truss rod.
That makes no sense to me, but I would welcome any advice or information that can help. Also, if you need a video of the rod action, I can provide that. It simply tightens to the right, and loosens to the left until the nut threads off the rod.