I'm currently using an E2 with 510 connection cartomizer in one of my GGTS AVS units.....left the liquid ring completely open, no hole punching in tube, and it seems to be working fine. Adjusting air as always with CR, and no apparent leakage into CT. It's a little long for the GG mouthpieces to fit, so I just put a drip tip on top. Cartomizer tests at 3.3 ohms, and I'm
vaping at 6V.
Just thought somebody could benefit from this experiment....
TVree