I suspect he's talking about these: http://www.sears.com/sr/javasr/product.do?vertical=TOOL&pid=00952162000&bidsite=&BV_UseBVCookie=Yes



If you can get one of these on the head of the bolt, the left-hand grooves will bite in as you turn it. Worth their weight in dope when you have a situation.

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1989 300 SEL that mostly works, but needs TLC