Mine did the same thing....Just don't tighten the wings down as to distort the fuse, wings, and fins. There isn't any vibration with a turbine so I just tighten them down enough to get the job done. I haven't had one work loose yet in dozens of flights as well as tumbling the plane.

Also, to keep from loosing the wing bolts when you take the plane apart I purchased a couple of small rubber "O" rings from the hardware store and slid them on to the bolts. The "O" ring keeps the bolt in place and is located between the fin and the wing when the wings are installed. I don't take the fins off.....You can still use the "O" rings if you take the fins off....You just have to slide the "O" ring on to the bolt between the fin and the fuselage. Although the bolts are metric, a long screw driver type 3/16th's Allen wrench makes tightening up the bolts a breeze.

Kevin