About a month ago I bought a SMOKTech Extender mod and last night it just stopped working. My KangerTech Aero tank 2 works fine with my old eGo battery, so I know the problem is with the mod. I cleaned around the firing pin and tried two different fully charged batteries, but it still didn't work. Took my mod back to the shop where I bought it and the owner took it apart and fiddled with it for about a half hour. The weird thing is that he got it to fire for a few seconds after messing with the button mechanism, but then it just abruptly quit again. I've been messing with the button mechanism for a couple of hours and can't get it to work, and it's really driving me crazy. Any suggestions?