On this peticular kit the wing tub holes are made into the fusealage. all I needed to do was drill a pilot hole with my center hole locater . Then I cut a small piece of my wing tubing to use as a marker. I then drilled holes in both sides up to a 1/2" drill bit. Then I used the Drimmel tool and a sanding drum to finnish the holes. I ended up with a very snug and perfict fit. Also on the inside of fuse, where the tube slides in I doubled up with some hard ply to help hold the tube steady. In the last pic showes a nice fitting wing tube!!!
And to think this did not take long at all.