I had been using the eGo Mega DC Cartos on my chuck with an adapter but last time I went to order from madvapes I saw they now have Smok Tech Dual Coil Mega XXL's these are just like the eGo ones but with no skirt at the bottom. I picked some up thinking I could ditch the adaptor. They almost worked to. The problem is with it screwed all the way in the bottom seals against the drip well so no air can get through. I came up with a no adaptor solution though. I DO NOT RECOMMEND ANYONE TRY THIS. I took my dremel with an engraving tip and ran it around the edge of the drip well. Sorry Thag. Now It works prefectly but my drip well looks pretty ugly. I'd post pictures but all the ones i've took come out blurry.