Wagstaff Extra 300
I fixed the extreme tightness on my wing tubes last night. First take fine emery cloth and buff down the aluminum wing spar wipe it off and wax it with an automotive wax. Then take some 100 grit sandpaper and sand inside the tubes as far back as you can reach with your finger inserted. most of the binding on mine was very near the edges where there was a little excess glue . They now slide on pretty well, still snug but much better. Got the stab on last night. The fit on the tubes was much better on it.