I was just finishing my 1/4 scale cub and realized once I got around to putting on the control horn that I have the elevator flipped. It has a re-enforcement on one side for the elevator control horn to mount. But, I messed up when I installed the trailing edge and put on the hinges. So they are there to stay I guess. I used them epoxy style hinges. Now what do I do? I thought of re-enforcing from the outside with some ply on both sides.

seems like you have some choices, reroute the elevator pushrod or open up the covering on the elevator and build in a support where you need it and then recover. probably best to go in from the bottom. "they fly better once they're fixed" Doc

Just poke some holes in the covering where the horn goes and wick some thin CA in there. It'll be fine

If I understand the problem correctly, you have a plate installed on the top of the elevator already and have covered the elevator.

Keep in mind that I have not done this, but here is my suggestion of a possible solution that I would try.

If the plate on the top is not bothering you (it is flush with the covering), then you could make a thin ply plate the size of the control horn base, trace its outline onto the bottom where the horn mounts, cut away the covering, and retro-fit a plate on the bottom.

If you can hit it with something fuel proof (if needed) to color it, fine. If no color paint will work, cover the plate and leave the bottom wood bare to affix it to the elevator. Then mount your horn.

You will want to use the bottom horn to locate the position of the holes to be drilled, though, because you won't have any leeway on that side. Good luck, Dzl

Making a plate the same size as the base would be no different than just mounting the horn.

I plan on making a plate about 1" x 1 1/2" on top and bottom and form it to fit the elevator curve.

That should work

Is a plate really necessary? It's the wood that you're clamping to that makes the difference, not whatever stuff you stack on top of it.......

its supposed to have hardwood in there, and i screwed up, so that balsa caint do the job like it can. If I would had done it right, then you would be right. But since I messed up, I have to put plates on the top and bottom to re-enforce it so it wont break, and I would bet money it would sometime with this weight of plane.