I'm no expert. But I think I would hit it real well with the WD40, (I like Tri Flow myself) then turn it back in & out a few times. See if that loosens it up. Be careful not to break it off or strip it.

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Sonny


86 190D N/A 2.5L Auto 265k "Ruby" -Sold-
79 300D 242k "Condi" my first -sold- RIP
2013 chevy sonic hatchback - had to for work