http://i244.photobucket.com/albums/gg22 ... imming.jpg
Take your neck, and cut the business card so it'll fit around the screw holes closest to the bridge. Now take a small piece of sticky tape, and put it so half the tape is on the card, and the other half is on the butt of the neck, this just keeps the card in place while you place the neck in the pocket.
Screw in the neck and the jobs done.
Simple, neat, and if you need a greater angle, then either double up the card, or if you need to use picks, i'd put one around each screw hole and one between them, but i've never had to use picks.