Did you ever figure out the adjustments? The vertical is easy, long black screw with a white cap, sticking out of the assembly and easily hand adjustable. But try as I might (even looking over and over at the instructions in the manual), I can't find the blasted horizontal adjustment. My driver side headlight just "feels" like it's pointing too far towards center for my driving, I'd like to bump it out just a bit but can't figure out how.