One of my Sutbtank Mini's developed a major issue. I have ensured that the center pin is fully against the bottom of the coil head/RBA section. I took the coil out and screwed just the base down flush on one of my Provari 2.5's (fixed pin) this forced the center pin WAY up in there. Then took it off and put the head back in which pushed the pin back out (won't sit flush on Provari). No matter which RBA (I have 3) or replacement coil head I put on it the ohm's will majorly jump all over the place each time it is fired. A 0.5 ohm coil reading anywhere from .75 up to an excess of 5 ohms!!!! Talk about a dry, hot, make you wanna wish you were dead hit when a Sig 150 throws the voltage to fire a 5 ohm coil through a 0.5 ohm coil with the medium sized air flow holes. Has anyone else experienced this? Any ideas or suggestions? Maybe this is the reason they sell replacement bases, not stripped 510 threading like I assumed. Not really thrilled with the idea of spending $7-8 for a new base, and of course my preferred vendors don't care the spare bases. The sites I have found them on all have higher prices on other items, makes it hard to justify buying other stuff to get to the free shipping mark.