I used ca to secure the dowel in place when I set the wing alignment before I installed the lower fuselage piece. I wanted to make sure it was glued both to the sides and to the bottom of the servo tray where it seemed that that was a design consideration as it dowel in combination would absorb most of the inward force of the wing root. The servo tray adds most of the rigidity to the wing center structure, and I did not think it would be all that easy to secure afterwards. And it is a going to be a bit of a pain when I finish the fuselage sides, but I wanted to make sure about it bing fastened well. I will also need it for a reference for the fairings that I am going to use to blend the wing into the fuselage with, as well as the wing tube. The wing is going to slide into a 3/4 inch pocket on the side of the fuselage.