[fordy_nine]

The problem with soldering is "wicking" of the solder up between the individual strands. This causes stiffening of the wire and, subsequently, an interface between stiff and flexible where the failure occurs during vibration. In the Army, back in the Sixties, we were taught to use anti-wicking tools to prevent these vibration failures on our mobile radars. The tool was a tweezer-like clamp placed on the stripped area of the wire to freeze off the flow of solder. It was made of chrome-plated copper to be a good heat sink while the chrome plating resisted solder from sticking to it. They were made to fit specific wire gauges snugly. Because of the materials involved, aggressive fluxes were verboten......Bob L