All of the drip tips I'm finding are actual drip tips. I remember buying some atomizers and they came with a simple, black, round tip that has a tiny hole in the top for airflow. These aren't cartridges really - they don't have foam in them. They're pretty simple and symmetrical-looking and are used just to get you started. I've looked all over and I can't find any of these things. Does anyone know where I can get some?