waltersalas OP
I do not recommend the Mint. I have been down that road. It is very difficult to see the parallax implemented by Yip with his mirrored protractors and worse, it does nothing to guide you to proper azimuth or SRA or VTA. And, even if those shortcomings were ignored, the Mint relies on accurate specification of P-S. Good luck with that. I guarantee you a stiff neck, bleary eyeballs, and frustration if you use the Mint.
As for Schubert, I would love to know "1/4 inch off according to what?" Schubert must have been too cheap to pay for Brian's travel time and his work could easily have gone "off" in transit. Further, Brian is for all intents and purposes using an oscilloscope by using a software system that implements the same methodology in more sophisticated form.
There is so much misinformation on this forum that my head wants to explode. I need to find a better forum with better informed denizens.