Anyone have some good advise on setting up a vpi jr. upgrading carts

What arm is on your Jr.?

It is the arm that came with the jr, as a demo model, its a good friends table, he is going to change out carts,i guess im the lucky one who is going to really do it, my friend is a music lover, but is severely challenged on the tech/set up side, i am going to look at the table closely next visit to see exactly whats what about the arm, but it most likely vpi jr arm ,i dont think it unipivot.I probably ought to talk to vpi directly about this.

Chances are it is either a Sumiko MMT (S) shaped with removable head shell or an AudioQuest PT6 - straight arm with a fixed head shell. They are Jelco designs, made in Japan. Both should have have an Allen screw on the arm base that you can loosen to adjust the arm height.