Simply solder the screw in place. It's easy and quick and will hold as long as the element lasts. One of my hobbies is making turquoise jewelry, and silver soldering is always a touchy proposition. Not so with the Solder-lt klt. You can solder at a point to hold a piece in place, then form the metal, and move along, soldering as you go.
Coax fittings become very easy and simple to solder.
Frankly, as you can tell, I was extremely impressed with the kit. I don't expect it would eliminate normal circuit-board work, but for tough soldering chores it's the answer. The Solder-lt kit comes complete with the pastes mentioned above, plus the torch and a soldering tip.