I carefully super glued a side mirror switch just like yours thinking if it worked, good, if not, I would get a new one. It was 6 months ago and it is still going strong, has not broken since I glued it. Good luck, they are about $30 new, $10 on eaby

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red