Tried a Protank2 on my E-power 14650 but doesn't seem to make connection (thinking the 510 thread post might be just a tad too deep as the mini vivi-novas have a spring loaded post where the Protank2 does not) Do you think sanding down the top of the 510 thread on the button mechanism enough for contact would work or do I need an adapter? Any advice on making the E-power 14650 and the Protank2 play together is much appreciated.