The black adjuster on top is actually the up-down adjustment for the headlight and you adjust it just like the others. The toggle part of it is to manually adjust it (in case you don't have vacumm adjustment). Leave it in "normal" position and adjust the headlight in this position as well. Put the "toggle" in the other position when you have a heavy load causing the front end of the car to point up more than usual. Bosch lights are cool!

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