Thanks Baditude for the info, and I agree that these mechs probably aren't safe to use, but I'm having a hard time letting them go lol. I love the way they hit so much. Figs I have the pulse and love it. It doesn't mess with your batteries. A lot of people have told me not to go posative down with the machina, and a lot say not to go up with it, so I'm confused as hell about this. I am using the 18650 adapter over the top of the posative, with posative up how it is shown in wismec instructions. If I go down with it, then it doesn't have that nice feel when I press the button. It feels wonky to say the least. In the you tube reviews everyone does it differently, and nobody can agree on the right way to do it. I think maybe the metal on the negative contact may be stronger on the bigger 20700, so I will try that next. Thanks!