Why not cook marshmallows on my under dash fire?

Well I actually redid that splice because of what you said before. Before I was using a cheap gun from autozone, only 35w with cheap solder. I went to hobby lobby and got one of their 100w guns with lead based solder. The tip is a bigger tip, not exactly sure on the size.

What I am looking for is the crimp splices that they use in the MAD article. Non of my local stores carry them.