"phasing" Correct, mech adv will not move it/vac adv will. mech adv shifts the rotor more CW (advancing the timing) cuz it reaches the cap terminal quicker but the phasing is unaltered. vac adv shifts the magnet CCW so the tooth reaches it earlier (advancing the timing) cuz it fires earlier which also shifts rotor phasing CCW. I think some dists just have poor quality control especially on the lower tang to top rotor clocking relationship. dig out your light/drill that hole.
