ORIGINAL: scratchbuildC
I have a servo in each wing and I have put 4-40 threaded standoffs on each aileron the conrtol rod is connected with a plastic connector to the standoff and the rod has a z bend connecting to the servo wheel. I was thinking the holes in the servo wheel it self.
If your radio can be programmed for differential I would setup the linkage so there is no differential and do it all in the radio programming. That would give you the flexibility to easily change it. Before programmable radios we did it with the linkage configuration.