take out visor..perhaps tightly wind some electrical tape over the plastic bushing and then also the metal part that sticks out the end about 1/4", wrap it really tight with say 5 or 6 layers then reinstall to see if that does it for you

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.