I didn't even screw it on the tight. I was also told by the store where I purchased it at that I should refill it by using the mod. I didn't do that this time. I took it off my provari ( easy) then screwed it on my lavatube now I can't get it off. Everytime I twist the tank just moves up the the cartomizer won't move. Help me get it off so I can put it on my provari. Thanks