I dont know what your internal pluming looks like , but I have made my own rods by taking two 4-40 rods incerted into a carbon fiber rod then glued with JBweld .
The two 4-40 end exist out the back of the plane , the single carbon rod is run to the servo and another 4-40 rod is added with a clevis attched to the servo.
For interal smooth support I run a plastic white tube over the carbon fiber rod so the carbob pushrod can slide and be supported inside the fuse .
This give me one servo , a rock solid set up and smooth internal support