Sport mirrors how do you pull them apart for painting?

Reviving this thread... I managed to get the passenger mirror lens out, not with out a chip, though, but it wasn't perfect any way, and I can see why mirror is loose, easily fixed with a pop rivet, but danged if I can figure out now how to remove the ball joint stud from the housing, its pretty darn stuck in there, and it really needs to come out for a nice strip and paint job.