So... my wife is very hard on mods. She probably has sent more mods to the mod cemetery than I currently even own. It's a testament to this device that it has survived this long in her hands. But... There's an o-ring on the (male) chimney where you screw on the (female) atty heads. Bad design, especially if you don't include extra o-rings in the kit, right? She's lost the o-rings on all of her eVic AIOs now. I contacted MVS, where I bought them, and they found one spare that will fit that they had, but that's it. They suggested I contact Joyetech. Joyetech support said, in the same e-mail, that they didn't sell the part, then asked what the part was that I had clearly explained as I did here, then asked if I could send them a picture of the part I had already explained was lost. Frustrating? Yeah. Anyone know where I can get these o-rings and what size?