I have 4 Evod clearos in rotation. I ordered some extra bases because one of the originals was a little scratched up and I wanted an extra so I could dry burn coils even when all my evods were full. All the bases seem to work fine on my evod batteries, but since switching over to the itaste battery, I've had a problem. At first it seemed to be that one of the evod bases wasn't screwing on right to my itaste. Now 2 of them aren't working. They look like they stop one thread short and won't budge down any further. They aren't making contact at all. I've tried unscrewing the bases and reattaching the coils, but no luck. I'm not sure why this is. Any thoughts?