Phil, I believe that Peter and I use the same approach, starting from approximately 90 degrees to the groove we fine tune by ear. Peter characterizes this as a "technically correct point" and I would describe it as a "convenient starting point", but we seem to be doing the same thing.
My point was simply that this recent method of setting SRA with a USB microscope often posits that 92 degrees to the groove is gospel. Nothing wrong with that and it seems to be most effective in your experience.
My point was simply that this recent method of setting SRA with a USB microscope often posits that 92 degrees to the groove is gospel. Nothing wrong with that and it seems to be most effective in your experience.