The adjuster consists of a ball and socket joint mounted to a gearset that allowed you to adjust it.
Take the headlight out and you will find that the adjuster is removable with a quarter turn counter clockwise. You will see the arm with the ball on it. Extend it out fully by turning the adjuster and insert it back into the headlight, feeling it click back into the socket joint. Carefully adjust it in slightly to make room for you to reinstall the adjusted into the headlight housing. Adjust carefully or you will pop it out again, but no lasting damage should have been done