[rotorwrench]

I only use brass when I have no other choice in my kit. I purchase every old copper terminal I run across. You just can't beat copper for good energy transfer unless you own a gold or silver mine.

Most solder paste types don't use resin. I use the stuff for silver soldering but that's about it. Too much solder capillates too far up the wire and makes it brittle. Acid type flux can be corrosive.