Just to make sure you get those little o rings in right(very common issue), here's the procedure from the gg wiki-
Replacing the Atty Connector center pole o-rings:
Unscrew polygonal nut(1 on diagram)
Take out the center pin and the polygonal nut out of the delrin connector(4)- no need to remove connector usually
Push out the o-rings from the connector if they are stuck inside (use the center pin)
Clean the o-rings put vaseline on them
Put the polygonal nut onto the center pin
Put the o-rings on the center pin so that the polygonal nut is stuck between the bottom of the center pin and the o-rings
Push the assembly carefully into the connector
Screw the polygonal nut back onto the connector
The procedure is the same on the UFS too. O-ring #5 in diagram is no longer used.
Video:
Re-installing or replacing GGTS center pin o-rings - YouTube
Golden Greek - E-Cigarette Wiki