For some reason my 510 to 801 adapters aren't working. I ordered 2 total. Each from different sites but both do not work. Their are no errors on the ProVari itself but the 801 isn't getting power. Not sure what's going on?? Does provape have a special 510-801 adapter? Do they plan on selling 801 top caps for the ProVari? Any suggestions for resolving the issue?