This is actually my sixth mod, but only the first one I've posted. The others were just copies of what has already been done. This one may have been done before, but I am quite thrilled with it. It is very compact. Has a master on/off slide switch and a momentary pushbutton tactile switch. It uses one 10440 li-ion battery and puts out some great vapor and killer throat hit.
I used a 2x AAA enclosed battery holder (Radio Shack part number 270-414), a size M coax power jack (Radio Shack part number 274-1582) and a 9.5mm tact switch (Radio Shack part number 275-003). I got the slide switch from another battery holder from RS (the slide switches from the 4x battery holders fit perfectly on the pins in this one, just had to cut a hole for the switch to come through.
Everything is held in place with epoxy. I left my wires a little too long on this one, so you can't see the wiring very well. I will be glad to explain that part if anyone needs the info.