I was going to remove the battery cable on the rear of the alternator on my '93 190E to crimp on a new lug. When I attempted to remove the bolt, the bolt would turn but wouldn't unscrew. This is the factory cable, lug, and bolt and hasn't been removed since new.
Anyone else ever have this problem?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible