how big are these things, are they pocketable? do they stick out a lot on a ego type battery?
and are they cleanable or when they have filler, you can't clean them?
The tanks are just over 3/4 inch diameter and 1-3/4 inch long without the tip. They are wider than an ego...pocketability is a matter of opinion so I can't really help you there.
The tanks are re-usable. You may be able to clean the carto, but they do have filler in them. As long as you haven't burnt the filler, you can probably clean and re-use them. They do sell replacement cartos so if cleaning doesn't work, just put in a new one.
how did you modify it? are you talking about the newest fluxo tubes?
I used some "empty battery tube" (you may be able to use an old stainless steel carto tube, but you will need to make sure the CE2 will fit into it) and cut a piece the length of the thickness of the top cap and another one about 3/16-1/4 inch longer than the thickness of the bottom cap. I had to remove the inner o-rings from the caps and push the tubes into the caps. The tubes fit tightly in the caps and I've had no leaking issues. The bottom tube sticks out of the bottom cap about .2 inch. I had to fiddle with the length of the bottom tube to get the CE2 cup to be in the right position with the top cap. You can then use your method of choice to seal the cup to the top cap.
I'm using the previous version of the CE2 XL. Just remove the plastic tube and push it into the modified bottom cap. I don't have any of the newest ones, but as long as the base diameter is the same, the new ones should work.