I have used nylon tube to guide the pull-pull for years, one model now 12 years old. I use braided stainless steel nylon clad fishing line for the cords and no problem ever. I like the tubing to be full length as it will allow me to easily string new line should I ever have to and it prevents any dirt or foreiegn objects that might get in the area from causing any problems. I also use the ferrules from the fishing supply counter for the crimps. Small, neat and reliable.