Also, do this..........

Lay all the hinges that're going into an aileron side by side. Pretty wide, right? With all that area, no need for bolts.

BTW, since this is a beginners forum, some advice about the horns...............
ARFs are put together by people who mostly have no modeling experience. So the wood that they choose for surfaces that get horns bolted to them, is just whatever wood is in front of them. When you build your own models from kits or scratch, you know what wood is going to be used for. And you can pass on punk wood and choose good solid wood. You can also choose quarter grain (but that's another topic) to be almost warp free. So..........

When you're about to bolt the next horn to it's surface, take a close look at that surface. Does it feel soft to you? When you tighten down the bolts, does the horn easily dig into the wood? The covering give a lot? If so, and you're building anything larger than a park flyer, think real hard about doing a very simple toughening up step or two. CA into the holes really doesn't hack it on a hard charger. May be good enough for some, but false security for others. The decisions are ones you will gain more experience to make as you go along. But you need to think about them now as a beginner. A very small "patch" of thin plywood could be the answer. Look how small the base of the horn is. Think about how much force the surfaces are going to see. Might not need any patch, might need more.

Wanna learn if this matters? Walk around the flight line next time you're at the field and look at all the airplanes. Look closely at every horn you can see. Bet you find at least on loose one. Hope it isn't on one of yours.

Beauty of this hobby is that we learn a bunch as we go along.