what's that circular plastic above the rusted screw bro?? i have no clue wat that thing is..it turn and twist freely but have not clue the function of it..got any idea???
It covers the bolt to adjust the left-right angle. It's covered so you don't move the lights into oncoming traffic and blind everyone. To access it, you need to break the plastic cover off.
The bolt you can see does adjust the height of the beam, though. Make sure your car is around 20ft away from the wall the lights are shining on to properly adjust their height. Being too close to the wall won't show you the difference in height of your adjustments, and they'll most likely come out uneven when you pull away from the wall.