I performed a cursory inspection of my 420SEL's exterior mirrors, but can't figure out how they're attached to the vehicle's frame. (Both are somewhat wobbly, the passenger side especially...)

Any help here will be appreciated--as always!

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)