VPI VTA Base question

Remove the arm and measure spindle center to pivot spike. It should be 258mm.  The 12” is 300.

I have the proper P2S distance. The cartridge is pegged to the rear of the headshell slots and it needs to go back a bit more. 

Just trying to find out if I got the right base at this point.

That’s come up before on certain carts.  Could be worth a search.

If the VPI forum is still active, might be worth searching. Reaching out to VPI is in order too.

Are you using the VPI protractor? If so, it's supposed to be a distance that's somewhere between Stevenson/Baerwald. If you have an aftermarket jig, perhaps try Baerwald, which might push the cart more forward?

I've read random reports some cart brands for whatever reason just won't cooperate with any amount of fussing.

Thanks for the response's so far........

but back to my original question- can anyone tell the difference between the 2 arm bases? Something visual or something I can measure? Visually they look the same to me on VPI's website.

I recently acquired what's supposed to be the JMW VTA and I want to make sure I got the right one before too much time goes by.

I do have an email into VPI, but the site says may not hear back from them for 3 days.