Looks like you want that part to rotate without deforming the head actor? Save a copy of the .cr2 and in a text editor find these channels in the head actor

twistY part_twisty

jointZ part_jointz

jointX part_jointx

smoothScaleY part_smooY

Put a * in front of each or delete them. Test to see if part is rotating without deforming. Repeat for each left and right part. If that part is meant to bend smoothly from the head actor with just deformation to base of part you would need an additional bone to act as a child of the head and the parent of the rotating part, children effect their parent.

It's a little difficult to determine what you are trying to do and how you are attempting to do it from your illustrations though. Also depending on what you are trying to do you might also want to switch off bends in the 'part' properties to see if that's a viable solution. Maybe PhilC might see this and know?

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