So far I haven't had any problems with the wing bolts other than putting them in as my hands are to big! I read on E-Zone in the reveiw that the cg needed to be moved back to 125mm. I have moved mine but have not flown it since. The weather here in VA has not been cooperative at all most of the time the wind has been in excess of 30mph! I will post a flight report with the CG moved back soon as I get back from Sweden in April .