VPI VTA Base question

Does anyone know how to tell the difference between VPI's current JMW VTA base, and the 12" Unipivot Base? Something visual? Or measurements?

I can't achieve the proper alignment with my 10" Fatboy arm and want to make sure I got the correct base.

markpao09-25-2022 5:13pm

wlutke Details Discussions Posts This discussion Message User 708 posts 09-30-2022 at 12:32pm Copy Comment URL Report Comment Edit Delete My original (1995) jmw 10 has the arm pushed into the bell housing for a friction fit. It can be less than seated and feel secure. The Fatboy looks similar. Maybe get half a mm?
wlutke Details Discussions Posts This discussion Message User 708 posts 09-25-2022 at 05:20pm Copy Comment URL Report Comment Edit Delete Remove the arm and measure spindle center to pivot spike. It should be 258mm. The 12” is 300.
wlutke Details Discussions Posts This discussion Message User 708 posts 09-25-2022 at 05:32pm Copy Comment URL Report Comment Edit Delete That’s come up before on certain carts. Could be worth a search.
wlutke Details Discussions Posts This discussion Message User 708 posts 09-28-2022 at 12:50am Copy Comment URL Report Comment Edit Delete I see you replaced an “original” jmw 10” arm. If you are using the vpi jig for that arm it’s for a p2s of 250 mm and a true 10” arm. The fatboy 10” is actually 10.5”. Could that explain your situation?