To make servo wire tubes, get a dowel rod or broom stick, heavy duty paper (butchers paper or a brown paper sack works well), some scotch tape and some spray adhesive. Cut the paper into a square or rectangle shape. Now, spray the adhesive over the entire surface, light coats work well. Starting at a corner, with the adhesive side out, roll the paper around the dowel rod. When you get to the end of the paper, tape it in place and let it dry. When dry, slide the paper off the stick and cut the ends to desired length. You now have a light weight, strong tube to put in wings and fuselages to route servo wires.