I will concede there is a lot to the details of linkage that is confusing to the newcomer. Without knowing the details of your model, I think maybe the easiest way to put Z-bends in steel pushrods (I presume when you say "wire" you mean solid steel pushrod stock). Something I haven't seen before appears in the latest mailing from Tower Hobbies, the Great Planes Precision Z-bending tool (stock # TE3934), which has a little pin that you can insert into the servo arm hole you want your Z-bend to fit into. Set the pin in the hole of your choice, then squeeze the handles on the wire and Presto! your Z-bend is at precisely the right length to slip into the hole.

Now you have to unscrew the holding screw from the hub of the servo arm, lift the arm off the servo, jigger the Z-bend into the hole, then put the arm back on the servo and replace the screw.

If you are off by a small fraction of an inch, you should be able to screw your clevis at the tail end in or out to get zero deflection at neutral servo setting.

At $20 this is not a cheap tool, but it looks like a keeper that you might make use of for a long time. If not, I'll give you $10 for it when you're done with it.