Robotic Rigging and Bone Constraints Problem

I’m trying to get two bones to attach to a single object in a way that keeps the transformation of the red line static.

I’ve tried restricting the movement of the bone within the IK chain (pictures show that there are no restrictions, but I did try) to allow zero rotational movement, but the “Neck Base” still rotates weirdly and not smoothly. It reacts the same way without any of said rotational restrictions, if that helps.

I do have a Bone Constraint on both “Neck Rod Front” and “Neck Rod Back” to share the same rotation angle in only one axis as shown.

Is there a way to connect “Neck Rod Back” to the “Neck Base” to maintain that angle?

Is there a better way to complete this method of movement?

Here’s a link for the file for testing.

Pictures and GIF:


Don’t double post - wait for the Mods to moderate your first ten posts please. My answer in your other identical post…

Cheers, Clock.