It can be done, but I will have to use a drill. The end of the eGo mega CYLINDER cart comes appart much like the eGo mega cartos. It is also a
three peiece design. However, there is a "dam" in the cart designed to keep
juice from getting to the tip, again much like the eGo mega carto. This dam will need to be drilled and my cheapo soldering iron did not reach far enogh to put much of a hole in it. At this point, you "could" just remove the mouthpiece of a blank cart(filler removed) and drip away, but the likelyhood is that it may flood doing this. I'll play w/ it some more and report back. BTW, I don't know if the cone carts are the same as I don't have any. But you should know right away if you use a paper clip or tweezers in the hole to pry it open.