I have never seen one come off without some force, even if the stud itself was lubed prior to tightening, then dissassembled shortly thereafter (Doh!). I would have to wonder if it was fully seated in the first place.

Wait! I take that back! I saw this once when the tapered seat had been partially damaged by a bad job of drilling out a seized stud.

"Gritty" is bad. Smooth and stiff is good.

That is why sex on the beach is overrated.

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1986 300E 5-Speed 240k mi.