the powerpro is a custom tube that requires you to disassemble your provari and then insert the board and the topcap, then lets you use a 26650 battery. there's a video of how to do it and it just had me screaming "whyyyyyyyyy, whyyyyy would you do this!" at my computer screen.
umm nope then, not me, i just prefer to mod/refinish the real tubes, and i picked up a sort of non working one cheap. when i opened it i could see the button coming undon and upon further inspection i got to see inside. under the rubber button is a round piece of metal with a tab like the letter Q but with the tail inside. when you press the button it presses this tail onto a contact in the center. i can see this switch standing up to massive abuse with no moving parts inside.
the picture is that switch after i reassembled it. sturdy little board BTW.
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