This method seems to focus on the lower control arms, mentioning some sort of kit.
How to Repair a Camber on a Ford Escort | eHow.com
Since I've replaced my rear strut mounts, struts and springs, after several thousands of miles I've noticed that the rear camber is now off; evident by outside tire wear. Old springs being broken near the bottom, caused the vehicle to sit relatively low, (but *not* noticeably low,) compared to the replacements.
In essence, there appears to be several different ways to adjust camber. The way the manufacturer probably intended, was to have the springs cut/replaced.