I would just give Lee a call and ask. Probably the same as what I found in my Focus II wing, which is a false rib. Mine worked loose after 40 or so flights in one wing. Noticed it in time, did surgery and did some preventive maintenance on the other panel and haven't had any trouble. I'm sure that the design is fine, though I prefer my own approach. In the case of my Focus wing socket coming loose, it just wasn't glued enough. You're not going to see any ARF builder do what I am suggesting, because it is too time consuming. There's lots of Focus II's flying and mine and Don Sczur's are the only two I know about that had this happen. Both Don and I got ours in the first batch early last year and we both talked to Lee about it. I would bet they have been on top of getting the socket glue guy to "make with the gluing" the right way.

I'm not trying to get anyone alarmed at all, I'm just putting out a method I use which I feel provides more longevity over many, many hunderds of flights. If you periodically check for anything coming loose, you can catch these fatigue problems and go in and repair them without much problem.