Ok, I'm feelin pretty stupid. I am absolutely loving the platinum sr in a tank. I'm on the 2nd tankful and the flavor is awesome. I thought I'd try the fusion on another mod. I get it all filled put it on the low profile 510 adaptor, put it on the wench, and nothing. Absolutely no airflow. The adaptor blocks the carto hole I think. I tried the other adaptor, and nothing. Am I missing something?