Go to a good sporting goods store, even Walmart. Fishing line called Spiderwire is kevlar. Many different strengths. I last bought 80 lb test which has a 15 lb diameter(meaning the same dia as 15 lb nylon fishing line). If you want to use a plastic coated metal pull-pull try leader fishing line in a 20 lb test. Also at Walmart. While your there you can also buy the pliers used to crimp fishing leaders along with the crimping sleeves. The pliers will crimp the sleeve the proper amount. Then the only thing left to get for the pull-pull are the 2-56 threaded ends by DuBro; # DUB201. 4-40 Dubro # DUB618. I now have enough for several airplanes.

Don't forget to put a drop of thin CA on the kevlar crimps when finished.

Tom...