My experience with headlight adjusters is that the bolts get rusty from the heat, and they thread into plastic, to they often strip. With some creativity, you can probably repair this.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles