The gizmo's John is showing are called rigging couplers and DuBro makes and sells them. I make up my own systems but I go to the sporting goods store and buy braided stainless steel plastic coated fishing leader. It comes in a lot of sizes. You can loop this line and use a match to melt the plastic onto itself and not even need the Ferrel to crimp. On a simple loop and Ferrel I crimp the Ferrel then use a heat source, usually a soldering iron and just heat the Ferrel until the plastic coating melts onto itself. Just running the line through the Ferrel as Gene mentioned with an extra loop then crimping will keep the line from slipping. When I was at Bass Pro a few weeks ago buying more leader I found some really fine light weight wire that is perfect for small electrics. I didn't buy any though, I had tunnel vision while I was looking for the wire for the planes I was setting up. My bad, now I could use some.