I hope somebody can help me with this problem. I am at the end of a 1/4 scale sig cub build and am trying to find out what plastic or aluminum even cardboard tubing I can use, and where i can buy it, to put into the 1/2 in rib holes so I can run the servo leads through. Once the wing gets covered it would be a nightmare to try and get the leads threw if I ever needed to replace them. I know about tying a string or wire and threading it threw method but this is a long wing! This tubing should be as light as possible, obviously, and is proving very difficult to find. I have tried Home Depot, Lowes, Rona and many other places. They all have 1/2 in aluminum tubing only problem is the inside diameter is too thick and the servo leads will not pass through. I live in Erin Ont any help on this would be greatly appreciated.