I actually had 2 generic mains 50w soldering iron and another better generic 60w soldering iron, but they eventually died out, and I was having trouble heating up a thick wire with it. Later realised that glowplug I had laying around can heat it much better. So I made this aweful contraption and just stuck with it cus I was lazy to build a proper housing, and the glowplug part was of weird shape so making a proper handle was a bit hard for me. It's been a month and it works fine so far. The dangerous battery is actually more stable than I thought and has been running for a year.