ozzie my wing roots are 1/8" light ply with the same material doubled on the back side, with small eye hooks installed with CA. Supposed to use rubber bands, but I just don't trust this. O rings sound good, but now I worry about the hooks pulling out.

MTK Here's a couple of ideas: Attach ball joints to the wing root and use a section of threaded rod with Sullivan spring loaded ball connectors on each end. Another.....thread an alluminum rod for two sizes of threaded rod on opposite ends, say 8-32 and 10-24, secure the threaded rods with the a stop nut against the aluminum rod. You now have a differential screw. Install the correct blind nuts behind the wing roots, different sizes on each wing. To install the wings first thread the finer thread rod (8-32) into the wing and run through the fuselage, mate up the other wing and start threading the larger screw (10-24). Yes the other side will start unthreading from the wing, but the courser thread causes one side to enter the wing faster than the other side unsrews. Result? Tightens the wing halves together'''fairly light and very strong. Hope all that made sense, If I had thought of this before I would have used it but it's too late to install blind nuts in my wing roots now.

Thanks all for the ideas.
Steve