Right after getting my ProVari (has it really been almost a year ago?) I learned one reason not to tighten down the carto on it. Tighten it too much, and it really reduces the airflow. I just learned another. If you keep the carto a little loose, when it drops off the table and smashes against the floor, snapping off the carto and leaving the threads in the ProVari, it's really easy to use something small and back it out without messing up the threads.
Another testament to the build strength of the ProVari, I put a new carto on it, and it's vaping like a champ.
Another testament to the build strength of the ProVari, I put a new carto on it, and it's vaping like a champ.