BRF..you needn't do that if the VPI jig was used. However....perhaps Nedmoto was sent the wrong jig for your arm. I suggest calling VPI for clarification.
Classic 3 and Zephyr
I installed a Soundsmith Zephyr on a Classic 3 using the supplied jig and I was surprised how far back the cartridge had to be set back in the shell head. It's so far back the connecting wires seem tight. Being the Zephyr had the input from VPI I'm surprised by this. Does anyone with this same setup concerned that the cart sits so far back on the shell head?