Figured I'd post what worked really good for me on a big 3D plane. Never once had a problem with it, and if he's going to fly his cub like a cub it will be fine especially with struts. But like I said I epoxied the joiner into the looser of the two sides. Also the reinforcement plate that you usually glue on, I never glued on, just used it like it was instead. Mind you I did a lot of stuff, and had a smoke system and all so the wing loading was a bit high.