Oh, yeah, I've fished for 50 years with a 6 ft piece of 6-8# test leader, too. Worked great. I was curious, and 2 hours of google-ing later, I found what I wanted. It took me all of 10 minutes and pennies of line to twist my first one. Pretty neat. I made the next two out of 6 lb test .....about 4' long with a third of that a four strand twist. Each end has the loop made into it for a loop to loop connection.
I tested it out on the lawn and found it casted better.....more accurate and easier to get a tight loop for about 10 feet more of comfortable casting distance. It just allows the leader to turn the fly over better.....works kind of like a less severe version of a bull whip. A big plus is that it hangs limp like a rope.... no coils and kinks like a normal mono leader. I'll have to run it through few fishing trips to see how it holds up. Tough job, eh?