The protective film idea is good for adding strength to the wing too, but I don't think it will be thick enough to stop the rattling. Hope you don't mind me taking you up on that offer Paul, I appreciate it, I'll have a cold beer waiting for you...
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Two losi buttons per side would just about do it too, but I only have 1 pair left which were taken off my BK2. But the B4 shims are what it needs really.
The body is very twisted in that picture. I had fitted it in a rush and it needed more time.... its on well now and will look good for Jimmy at weekend.