The mixture asjustment screw is sealed from the factory. An experienced person can tweek it by feel. The rest of us need at least an ammeter, duty cycle meter and specs to set mixture properly.
I've never done this but from what I read there's a part that replaces what you have to break off to get to the adustment screw. It's available in FastLane, I think.
Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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