Glad I'm not the only one. Got a dozen cartos (4 of each type) and now apparently I have to go buy a new tool and learn how to use it or they are useless. My sole reason for buying some of each is a preference for different juice at different watts, so the trial and error method doesn't sound very appealing. I'm fairly irritated by it - I pay more for shipping and handling at V4L than anywhere else that I order from, but in the last 3 months I've had more orders mis-picked or mis-handled than I've had done correctly. (I would consider tossing 12 cartos that are different but look identical into the same package "mis-handled".) Customer service after the fact is fine, no complaints there, but I feel like a pest when I have to contact them every other week, and I'm losing confidence every time I place another order...