This response from the great people at VPI! I much appreciate their fast response to my questions and for corrrecting my error concerning VPI being at fault:
"The problem is the cartridge, not the arm. There
is no standard for stylus to mounting screws
distance, we set up for most cartridges that
people buy.
If the 2mm is bothering you loosen the two screws
on the dog leg and the four screws below the VTA
base and the dog leg will move and allow you to
reset the arm for the Shelter. Not that
difficult but sonically really not needed."
"The problem is the cartridge, not the arm. There
is no standard for stylus to mounting screws
distance, we set up for most cartridges that
people buy.
If the 2mm is bothering you loosen the two screws
on the dog leg and the four screws below the VTA
base and the dog leg will move and allow you to
reset the arm for the Shelter. Not that
difficult but sonically really not needed."