I figured that out on my own, the adaptor has a semi floating pin. In some cases that pin is just too short to make contact with the coil center pin and the 510 center pin of the slant top ProVari's. EDIT- While using the ProVape Tank Ring.
ProVape has always been all over the place with how high / low their 510 center pins sit.
So, Coldgin made mention of this in an email to Stacie.... I pulled 50 Adapters.... that's FIFTY... And I pulled 25 DIFFERENT PVs including an assortment of ProVaris from several different eras...
The result.... 100% connectivity.... UNTIL... I put on some "Beauty Rings" on several of the ProVaris.
My conclusion is that the 510 connector is NOT a standard. If somebody could direct me to a SPEC SHEET for a 510 connector that tells me DEFINITIVELY where that 510 pin is going to be, then I'm going to just have to say sorry folks... the Adapter isn't a fail... the 510 connector is. If the pin is too short to use with a beauty ring that doesn't belong there in the first place, and was not designed by either ProVape OR HoH, then how is my adapter, that connected to 100% of the test devices a fail? It has a snug floating pin... should I loosen it so then it can fail because people lose it?
I rarely get heated about this stuff but I have been saying FOR YEARS that the 510 is horrible.
I mean... come ON... the 510 connector is the problem. (And by that, I don't mean ProVari 510s... I mean ALL 510s... it's a moving target)