I just took A look at what John uses, nice tool and if John says it works then I'm sure it does. I have never been able to get one to work but I have used different ones. I have so many old servos and servo extension wires i just clip them off and solder them onto the servo wires. I no longer use leads, I just clip and solder on my own extension wire to the length I need or want. I can't make the tools work but I do know how to solder pretty well and make heat shrink tube work. So far I have never had A problem but finding the 16aug wire is getting harder, most hobby shops carry the 22 aug.