VV copper mod, Material used: 1- 4" piece of 3/4" L-type hard copper tubing, two 3/4" hard caps for the ends, vv kit from madvapes, 510 gold battery connector, blue led, 20 awg stranded wire, 3 amp temporary on/off switch, 5V-2amp 120 v ac to dc wall adapter, 3/8" brass insert for 3/8" poly...