What happened was you tried to drill through the old CAhinge. The drill wanted to go on one side or the other but not down the center.

When you cut out an old hinge, you have to move the new hinge to fresh wood. It doesn't mater what type hinge you use, you can't put a new on over an old one. If you had a friend with a mill, they could use a 1/8" mill and drill a new hole over the old hinge, but you are going to have trouble shapping the hole top to fit the shoulder of the hinge. Find fresh wood and have a go there. If you are going to use the Robart hinges, they will give you a bit more leeway on where to drill the new holes. Just make sure that you have enough wood on the other side of the hinge.

Iaquired a Twist 150 that had never flown. When the guy was assembling it, he used the wrong CA and on a couple places on the ailerons, he didn't get CA into one side of the hinge. I cut them out and the drilled and fitted for Robart hinge points. Then I got to wondering if there was enough wood for them. Imade a little wire with a 90 degree on one end that would go through the 1/8" hole and Icould snag the back side of the wood to tell how long the hole was. Fear confirmed, so I cut the covering off bottom of the wing and ailerons and then glued in and inch and a half piece of wood the same thickness of the wood in the ailerons. Re drilled the holes and now I have a full three barbs in wood. While you have the covering off, it may be a good time to plan on doing this. You can also fill the hole you drilled, just make a dowl of balsa and use white glue and push it through.Cut and sand smooth.

Ilooks is if the balas next to the hole has been broken. If so, Iwould cut the entire piece off and replace it with new wood. I wouldn't trust a butt joint there, especiall close to a hinge.

Don