I'm having a bit of user difficulty with my replacement glass (15mm). This is not my first rodeo with IBTanks and they've all been easy until now. So after a number of months I ordered and received a replacement tube. I pulled off the caps from my cracked glass and replaced the orings with new ones from IBT (noticed one of them that I threw away was flatter...thought this was just due to use...in hind site, wish I hadn't thrown away). Anyway, lubed up new orings, filled up, etc. Now, every time I need to refill, the bottom cap comes apart from the glass and yep, you guessed it, I have a mess. I have removed and reinstalled orings (I prefer dental pick). Used 2 instead of one, etc. hmmmmm.... Are the orings that come with the "complete tanks" the same as what are sent as extras? Like I said, the old one was flattened which actually aided in sliding the tank up the cartomizer without moving the cap away from the cap.... Thank you!