RE: Control Surface Linkage questions...
I like to have a soldered clevis at the servo end and a threaded clevis at the control surface end for easy adjustment.
Gave up with nylon/plastic clevises when I lost a plane to a clevis pulling loose from the rod.
I also use a double lock nut against the threaded clevis just to keep it tight and keep any slop out of it.
Only if room in the servo compartment is tight will I resort to a Z bend.