Any chance of getting some vice grips or locking pliers on that sucker? Sometimes if you can get a real good bite on the bolt head and then some sort of cheater bar and slowly apply pressure . . .

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman