Thanks. The difference is subtle. I think I need to flip them because I have the smoother side with the smaller hole facing down. And yes, I did use red loctite before torquing it down and marked a line across the BJ and UCA to visualize if it starts backing out.Happy to hear that you resolved the ball joint issue! After you confirmed that it would thread all the way in did you back it out a couple of turns and apply thread locker? I'f not I'd recommend that you do.
The steering arms install so that they angle outward with the larger diameter of the tapered hole facing down. In this photo the arm on the right is installed correctly with the one on the left held next to it so that the difference between the large and small diameter of the tapered hole is visible.