Ive dealt with a number of stuck posts and stems and any type of penetrating oil does nothing, I remember I soaked one for a good month before, when it becomes corroded together oil does nothing, at that point you've got to actually attack it with something caustic. I'm sure if I had more patience I could of found a way eventually, but it just wasnt worth it in my mind, and I don't really regret it, I'm not a fan of chrome oddly enough, I like chromed tips, but the stays woulda have to been chromed too.