I have had the SE kit since it first came out, but haven't built it yet, however, I have built several pattern planes that had plug-in wings, and I use a coiled spring which stretches from one "hook" to the other. Hook the spring on with a pair of hemostats if it is crowded in there. Most good hardware stores have a complete collection of these springs, with varying lengths, coil sizes and wire sizes. Pick one that is under some degree of tension when hooked up, but it doesn't have to be extreme.

On my Edge 540, I have a balsa block in the fuselage drilled to accept the spring, and it rides in this block until I am ready to hook it up for flight. Never worry about leaving it home that way!

Clair