Hi, iv been vaping for about 2 years now and am pretty advanced when it comes to vaping. I recently ordered the supplies to build a box mod but im not sure about wire size. The mod is going to be dual 18650 fully mechanical(no mosfet) wired in a series. I dont plan to build anything under .4 ohms. What size and type(stranded/solid) wire should i use. Would speaker wire be ok? cause i have alot of that laying around