I bought a Herakles tank, 18650 battery, and Eleaf 60 Watt from Vista Vapors. This was before I joined the forum. Anyway, I removed the O-ring and threw it out thinking I didn't need it. I contacted Vista and they said they don't have any and suggested getting some from Home Depot. I did and tried it out but the tank won't screw together. Does anyone know where to get O-rings for this tank? I'm pretty sure it might be a size issue and the people at Home Depot weren't much help either.