Ok so I found this trick on how to make a solderer.
It's an image file and it explains everything.
Now I know this works because I would use batteries before not the power supply and the pencil led would heat up like crazy. I used it to sculpt some wood.
This will make it easier to use.
I know it's not actually a life hack but it's certainly a useful and cheap cheat.
All credits go to the dude that made it.
Link to the picture.