I found and easy solution to the tight wing tubes on my GP Wagstaff. I purchased a 1" diameter flapper sanding disc at a local tool supply house and put it on a 12" drill bit extension shaft. With a drill motor you can sand the inside of the tube for the full length...just be careful to not oversand....it took about 3 attempts before I got mine to slide on and off with little effort. The flapper sanding disc is available in several sizes...I had to do the same thing to my Aeroworks 33% Wagstaff and it had fiberglass tubes but the tube was 1 1/2" diameter.