Have you ever noticed the extra notch on your JK's grille while scrubbing the bugs off? These notches are located at about the 8 o'clock position on your drivers side headlight and about the 4 o'clock on the passenger side. This is where your horizontal headlight adjustment screw should be. Yes, you could make adjustments with what's already on your JK, but this would require removing you grille and both headlights, making an adjustment, reinstalling your headlight and repeating until you're happy.
This write up will show you how you can skip those steps. I imagine stock and upgraded headlights would benefit from this.
Here is the extra notch in the grille on the driver's side.
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