Had a question bout our slk230 headlights... When we are adjusting the headlights is the actual headlight relector tilting or is it that shield that goes around the bulb that moves?? What does that shield do, I'm assuming it just reduces glare... but does it have anything to do with adjusting the beam in the correct pattern??? Techs please answer soon! I need to know this for my next project on the slk!!!