I have an eGo, and lets just say... My drip tip doesn't ... drip. When I drip 2 drops in it, it stays in the drip tip. I have a little video that goes a little bit more into detail, kinda hard to put it into words. YouTube - Drip Tip HELP ME! HELP!! 
Super T Manufacturing "wide mouth" delrin tip. You will be glad you did
If you're having that problem, take a dremel tapered grinding stone and round off the inner ledge. The juice won't stay at the top of the tip.Even the shorty delrin I have sometimes the juice won't go down but the aluminum works every time.