I believe you have no options but to replace the visor assembly. They're quite expensive, but I know how annyoing that symptom is. I will be more than happy to provide you with instructions on replacing the visor. Hope this helps!
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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'79 6.9
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8
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