Most important part is to get the rotor centerd in the termanal when it fires across the gap. It changes. My method is always simple, run it for a while with a new cap, there will always be some burning on the terminals and rotor, look if most burning is centered in the center of the tip of both rotor and cap terminal, this will be where YOUR engine spends most of its time and will be most important to YOU, then adjust acordingly (whatever method you prefer)to get the burn spot in the center.