I looked for a picture that I believe Dirty Dan posted, but I failed to save. Dan showed how he chamfered the ends of the tube to get a close fit at the ends of the tubing, which looks very "Pro-Stunt". If you look on McMaster-Carr or anyplace that sells cable, you should find a picture of a "thimble". The only difference is that a cable thimble typically has an open outer side, which you don't get with the tube.
I dug around on Google and found this site and a jewelry product that might just work for our use. It is partially open on the outside radius, which I think would be ok. You should be able to find such stuff at any good craft store, such as Hobby Lobby or Michael's. Their purpose is much like ours, as are the wire sizes. I didn't search for ideal sizes of thimbles, but did find this instructional series of pictures.
http://www.artbeads.com/handy-tips-cable-thimble.html The only difference would be using copper wire binding to secure the cable and a length (or two) of heat shrink tubing to secure the copper wire.
![y1 y1](https://stunthanger.com/smf/Smileys/classic/yeah.gif)
Steve