How to set caster?

..just as Snake said,although i had to bring the rear of the upper "A" arms out a bit to get a camber a degree or so within vertical.
..my toe in is a hair less than 1/8" and all seems fine so far...2000 miles and counting!
..i set the toe in with 30 "straight edges on my discs and the discs resting on 6 x 6 blocks of wood.