Yes, I tried a few times with my combination wrench, but it woudn't budge. But I was turning in the correct direction. Then I hit it with my impact wrench and it snapped right off. Thanks for all the information. I feel more hopeful now. American made-not Harbor Freight I guess.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out