Yes there is a tool to do the swagging with. The late Carl Shoupe used to make them. I made mine using needle nose pliers and a drill press. Takes practice to get it right. Either here or Stuka stunt is posts on swagging. So far have had no problems even over doing the pull tests. ![Coffee D>K](https://stunthanger.com/smf/Smileys/classic/sipcof.gif)
MBS Model Supply carries a swaging tool that looks to me like a commercial product.
They also carry sleeves that come in both black and silver (I think he packages them both into the same kit -- you'd have to ask him if you order).
When I swage, I color-code with the sleeves from MBS, and I cover with clear heat-shrink.
Or you can wrap with copper wire -- it's prettier. You can buy a 1/4 roll of #30 or #32 magnet wire, one each of some light color and some dark color, and your great-grandkids will still have copper wire for winding lines.