Hi guys, I've been vaping for awhile with the pen type viper but found these too messy and they gurgled requiring to pull apart etc. I bought the cool fire as I had read they were less messy however the mouth piece is too wide. Can anyone tell me what size mouthpiece will fit over the top that I can just push on to fit? If I can't get one, what whole piece (tank) will fit. Spewing cause it cost me 105.00 dollars. Shelliann