Put this together earlier and it rocks! I was surprised it worked after some of the issues I had with it. What ever you do don't get near this switch with super glue! It's too thin and will find it's way inside and ruin your day. I tried it and it's nothing short of a miracle that mine started working again. It was stuck but I kept working it and it just started working right again. I looked at all the builds I could and decided to go with the one pictured on the page where you buy the kit. The third photo. If you maximize it, it's a wiring diagram. I installed the switch on the board first making sure that it would work like that first, then the regulator and resistor. Switch and resistor on top then the regulator underneath. Then I soldered the connector and the positive battery lead and glued the switch in. I used hot glue on both side of the switch since I was unsure if I would have to replace the switch after the super glue nightmare. That only left the neg. wire from the master on/off switch. Piece of cake! Nothing was used that didn't come from Mad Vapes including the soldering iron and solder. I installed the batteries, screwed on a MAP
tank, turned on the master switch, hit the button and OMG! Worked like a charm........I was amazed .......it was fun! I tried it with the Map
tank, Ego tank, some Yeti cartos I bought long ago and some supposedly near dead 510's and it brought them all to life! I like 5v and this is a bargain if you like to DIY.
Thanks Mad Vapes!