My model is effectively one piece, it fits in the car that way so I never take it apart.

In the pics where you can see the wheel wells in the wing you can see a silver screw head next to the well, this
is threaded into the wing tube to stop the wing sliding off the tube, the're's one each side.

As I mentioned in a previous post my wings had a gap where they join the fuselage at the leading edge. I fitted
blind nuts in the wing root ribs & fitted screws from inside the fuselage to pull the wings against the fuselage. I
didn't post a photo of that because I'd have to remove all the equipment in the fuselage to photograph them, they
sit at the bottom of the fuselage under the fuel tank.