Check alignment of wings at center, sand the hole a little to make sure both wing roots match up. Glue in the wing sockets. Make sure they engage the rib inside the wing. You can fell it click as you push the tube through. I went about another 1/4 inch past. Check on straight table, with ruler, and wings in the chucks. Add some weight if needed on top to keep the wing straight. Before the glue dries double check Back, Center, Front (with wing tube installed)