I'll bring this back to your original question: "correct alignment for the arms designed by Ikeda son." All of his arms are optimized for Stevenson alignment, this is the only alignment method that he uses. I purchased a Mint Protractor and have absolutely zero tracking error with my SPU, Shelter 5000 or Denen 103r.
The downside on the Mint is that you can't vary the spinal distance. Dertonearm recommends the 231.5 distance on the FR64, you will have to buy a different protractor.
The downside on the Mint is that you can't vary the spinal distance. Dertonearm recommends the 231.5 distance on the FR64, you will have to buy a different protractor.