I would expect that is the inner null point for
222mm p2s, 14.5mm overhang, 21.55 degree offset angle.
Unfortunately I can't get into vinyl engine to calculate the inner null at the moment.
I note that vinyl engine has the wrong overhang listed for Rega arms ( 15mm ) so their published null points are incorrect. It is also possible like many arm manufacturers that the Rega alignment is close to but not exactly Stevenson, so you would have to use the vinyl engine calculator to generate the null accurately given the Rega specs.
Unfortunately there is a lot of misinformation on the net with regard to Rega alignment.


