Will be just fine. In flight there is not much force trying to slide the wing off of the joiner tube. On the other hand, there is an air load (force) on the front of the wing pushing on it which causes it to bind on the tube (friction). Don't you really think that if this was a problem that something would have done about it a loooonnnnnng time ago? Huh? Follow the instructions and all will be fine. Do a search if you want and see if anyone has any improvement ideas for the plane in general. Examine ALL ideas carefully before implementing them. The people who design these things know what they are doing(as a rule).