For those of you having issues with the rba section of the subtank mini not making contact or no atomizer issues I have found a fix. So first take the rba section off the base hardware. Then push the bottom contact pin up into the base until it stops. Then on the bottom of your rba section near the threading is a clear o ring. Remove this oring, it is not needed, and once this is removed it can screw down further to make contact with the pin. So far I've had 0 leaking issues and it's working 100% on my vaporshark rDna 30.