Take a look at the little bitty gold looking spring loaded contact in this picture on the left side by the big blue thing. That has to touch ground for it to work. In the tube mod it does since the tube is ground, but in a wood or non tube mod not so much. BTW, always put the battery in with the negative side down away from the module (you should anyway for other safety reasons in a metal tube) or it might let the magic smoke out.
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AHAA!! No wonder!!! The 'lousy vape' was fumes from last vape still in the atomizer cap! LOLOL!
Question... if I inserted a metal plate (say a sheet of silver or copper) in the back of the mod, to bend and touch the negative metal part below the spring, wouldn't that be sufficient grounding?