washer trick for camber?

Does anyone know how it works?
I hear you "put it in the rear, and for every 1" you lower your car you put in 1 washer"
Where do you put it? Does this actually work?
Any info is appreciated. Thanks.

where do you look after that?!?

check that found it...here is a better link, thanks for the original link!!!!

http://www.jdmfan.com/technical/suspension/rear_camber/