I've hit this same problem on many planes in the past. The hookup from the elevator pushrod to the elevator horn happens in a normally restricted space, between the fuselage sides. Bending 1/16" music wire into an "L" takes up too much space, and clearance is gained by hacking away some of the fuselage sides!
I've used those spring-loaded connectors, called "kwik-links", threaded 4/40, but I'm afraid they are not strong enough.
Ball links are out of the question, because they are BIG.
If you have a better idea, can you describe it so I can understand?
Thanks,
Floyd