Off topic, but what I do when I need a bit more heat on a chassis is to preheat the spot either with a small butane torch or a hot air station. This keeps the chassis from sinking the heat off the soldering iron tip.
My favorite Weller is the GT. I have three of them. The only downside is that they're so light, the weight of the cord often pulls them off the bench. They are really fast and they stay cool.
John