Dude, avoid the screw-thru-wingtube metod of securing your wing!!! It is old school and it WILL develope play over time.
I am not sure how your CA wings mount now, but I assume it's either a bolt through the side of the fuse into a blind nut in the root rib (the VERY best way) or it used aluminum dowls that fit into a socket in the fuse and use a pointed set screw to secure them. Not as good as a bolt through the wing root, but WAY better than the bolt through the wing tube. Don't waste your time on that mod, trust...
If you are worried about the wings flying off or something, there are other ways to safety them in place, like a cotter pin through a dowel pin after installing the wing. However, you shouldn't be worried about it...