I use the steel plastic coated fishing leader, I have it in different tests for different size planes. I buy Dubro rigging couplers with the hole on one end and the threads on the other. They come in 2-56 or 4-40. For the holding/crimping pieces I have a lot of small aluminum and brass tubing. I just cut about 1/4 inch pieces, thread the line and crimp it. I then use a soldering iron and heat the crimp tube and it melts the plastic coating a little inside so the line will never slide out. It's been 10 years sense I bought any of the pre made kits and all my planes have had pull/pull rudder. You can make the back tiller from 4-40 all thread and buy the Dubro fiber ends . There are a lot of ways to do it. Like Joe mentioned, I have laced the wire through the horn and wrapped the wire and heated the plastic with a match enough to melt it together.