Without the atty spike on the atomizer, the tank won't seal in the sleeve very well and you will get a pretty weak vape. It works much better if you stovepipe it with no tank. Two drops max at a time or you will flood it. Good for about six decent drags. Keep the eRoll pointed straight down. I used to do it a lot and kept a de-spiked atty around for dripping before I bought my HH 357 dripping atomizer.