I have an airplane with Robart hinges on the elevator. It is a 50CC scale. I bought the airplane from someone else. After a year of flying and shaking of the DA-50, I noticed the robart hinges are coming loose. Probably due to a poor job to begin with. I had an idea on fixing the problem instead of cutting them out and starting over:

Get a medium sized syringe.
Put Gorilla Glue (polyurethane) in the syringe through a cup.
Inject the needle into the area right next to the hinge until it is inside the cavity.
Inject glue into the cavity and make sure none comes out as it expands.

Sounds like a simple way to fix it without ripping it all out. Pretty much non-envasive.
What do you think?