the bottom wing is in two pieces. It hasa line up pin at the front and rear of the root rib of each wing half anda carbon fiber wing tube that goes thru the fuse. Originally, it was supposed to have a screw put in from the inside of the fuse into a blind nut in the wing to keep the wing secured to the fuse. There is very little room for that inside the fuse. I thought about putting a stud in the wing and then putting a wing nut on the inside of the fuse onto the stud when the wing is in place, but even that was an really tight fit.

As you can see, I mounted a pair of "eye bolts" with a slot cut in them to make them like a cup hook and then opened up a slot in the side of the fuse for these eye bolts to stick inside the fuse when the wings were in place. I then put an "O" ring across the two cup hooks to keep the wings from coming off. Easy to get on and off, no screwing in to anything and works great. I will actually put two "O" rings on at a time just for redundency.

This method has been used in pattern planes, etc for some time. Most of the time they just use rubber bands to hold the wings in place, but I elected to use "O"rings instead. Almost no give at all with the "O" ring.