damn, I have always done this by ear. Guess I need to blow $250...John, I'm surprised you weren't their first customer!! ;--))
Unfortunately (fortunately?) my SME V doesn't allow for such tweaking, so I have to rely on the skill of my cartridge maker. However, the Cardas test record has a white noise track where the L and R channels are 180 deg. out of phase to each other. If your preamp has a "mono" switch, activating it will combine the channels resulting in cancellation -- and when the azimuth is "right on", almost no sound will come out of the speakers. If you use headphones, or a digital VU or voltmeter to do the test (instead of your speakers) you will have no trouble adjusting the azimuth for maximum channel-to-channel cancellation. And you can "high five" yourself for saving $250.
.