FYI if you folks have not seen them smok-tek is making vivi's now and they are better by far than the original vision made one's. excellent wicking have not had any dry hits yet (35mls usage@4.1v,50/50mix) and a great new feature....spring loaded center pin on the 510. and they are dirt cheap, the mini was 5.99 at my local B&M.. dont fight another replacement head get one of these "smok"s
