When looking at my '89 420SEL from the rear, the right rear wheel appears normal, but the left rear wheel has a very obvious negative camber (the top tilts in toward the chassis). I've looked through my repair manual on disk (which leaves a lot to be desired) and found the specs on what the camber should be, but can't find how to adjust it.

Is there an adjustment? I know how to measure it, but how do I actually adjust it?