I've seen that problem before. With genuine Vision Novas, one has to tighten the coil head a little more than finger tight so they don't loosen when unscrewing the top, then they're nice and dry. With so many clones at the time Novas were popular, I suspect they may have been part of the problem.Back in the day I just never had any luck with Vivi Novas. As soon as the Protank came out though I was all over it. My vivi novas were BAD for leaking.