But if you're using a cut mouthpiece to overlap it, and then putting a mouthpiece on top of that, whats the difference? The mouthpiece itself is covering the fill hole isn't it?
how come I'm not a senior member? or ultra or supporting?
reg - to avoid the problem of the liquid around the coil housing, flick the CE3 like a fever thermometer with the mouthpiece end "down" a few tomes before filling. That'll force the liquid down to the mouthpiece so it isn't squirting out as you fill them. If you're using the syringes that come with CE3s to fill them with, the leaking you're having there is probably from the joint between the needle and the syringe, it's a friction fit. I use a 5ml Luer Lock, a "twist lock" for the needle, syringe and have never had any leaking problems and the needle always stays on. They're really inexpensive and a long 20ga blunt needle is similarly handy and inexpensive. Plus, with a 5ml syringe, you can fill five or six before needing to reload the syringe.
edit: Someone can try this if they notice it leaking. Remove the CE3 from the battery, wipe the battery post and the bottom of the CE3. Reattach it and hold the device upside down, vape it upside for a few drags. Return it right side up and remove the CE3, see if the leaking has stopped. I've tried this twice now and it seems like its helped re-establish its seal. Or something, i dunno these things are ....ed.