Dave for me I have had much better luck with thin piano wire about .32 or thereabouts. I also use an Ez Ajust on the servo and solder on Dubro brass threads for the clevis or ball cup. It runs in Yellow Nyrod inner tube. Much thinner and easier in cases where the tank is tight aginst the side and fexability is as good or better than the much heavier and thicker flex cables. One additional plus is its less drag than the either full Nyrod or flex cable and that means better servo resolution, centering not to mention straight nyrod getting longer and shorter with temperature.

I did have one soldered thread come loose once and that most likely due to my careless cold solder job but not since. Of course silver solder would even eliminate that.

John