Help ! I have a 1989 420 SEL (w126). Do any of you know how to adjust the headlights ? I see adjustment screws but when I turn them , nothing happens . Is there something I need to losen before I adjust ? Vaccum ?

__________________
"I have spent MOST of the money I have made in my life on expensive women, expensive cars, and expensive drugs. The rest I just wasted." - Myself "Belief in the supernatural, reflects a failure in the imagination." - Edward Abbey "Give me a firm place to stand, and I will move the Earth." - Archimedes

I have the same car and i would like to know how to adjust the lights also.