Cora, have you actually tried the rubber band method on a really stubborn stripped screw, or is this just from watching other people struggle with it?

Listen to the foreman every time. A dead man's load isn't worth proving a point.

I read somewhere that copper is better for carrying electricity but aluminum is lighter and cheaper. Heard a lot of old houses had aluminum wiring back in the 60s and 70s and it caused problems with fires if not installed right. That always stuck with me. For a whole house rewire I feel like copper is the safer bet even if it costs more upfront. I would not want to worry about loose connections down the road.