It doesn't matter anyway. That ARF has a two piece wing. The consumer is only responsible for putting together the halves, using the brace provided. It is all self aligning, and pretty much idiot proof. Sig will definitely have to bite the bullet on this one. And, they are a good company and will more than likely help you out. You need the instructor to verify that the wing was bolted on correctly, and that should do it. I'm assuming by your post that the instructor either works for, or owns the LHS? This will help a lot.