mecanical mod fit imr 18500 3.7v to fit 510 connector taken from an old ego battery add a switch on the bottom, some M3 screws basic soldering skills needed photos of the thing in action coming soon I give the scad file for you to modify, it's crappy I know but it works, no time to fix right now, keep in mind that this design is very basic, I wanted to create the thing very quickly because my f!*@$! electronic mod is broken, also beware to do things correctly to avoid shorts with a 18500 battery, you're responsible, not me. keep it safe and simple. brgs made with geany text editor and openscad