Ahh, the o-ring fix. I hadn't thought of the ramifications that might ensue with the o-ring fix. I don't know, really. I have all of my Siren's fixed already, even though they are still in their boxes except for (1) 22mm and (1) 25mm that I have out and using. I know that some of those Siren's were a Royal Pain in my Kabootle to put the o-ring fix in, so I'm not gonna undo it for testing. Maybe someone that hasn't done "The Fix" yet can try a 3.5mm or 4mm coil with KGD wicking and let us all know. That would be very interesting to hear about.