Dear @lewm : ""
MC, If you make an error locating the pivot point while setting P2S distance, it is quite possible to end up with only one null point on the playing surface of a typical LP, or none at all. Plus it could exacerbate tracking angle errors that occur at every other point on the LP surface. ""
You are not only been extremely dramatical but " out of game ", you are wrong and your statement about the null points is totally false.
. Look, say that you need 250mm as P2S distance and you are using Löfgren A so you make the set up and with out knowing your P2S distance is off by 2mm ( + ) ( seems a " normal error " we could have. ). Now:
the null points for 250 are: 66mm and 120.89mm and guess what: are the same for 252mm and for 300mm too because null points are determined by the most inner/outer groove distance and not because P2S or EL. This is true for Löfgren B or other kind of alignment.
We have to take in count that inner and outer most groove distances are 2 of the 3 inputs to make the alignment calculations, the other is EL.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.