Jan van den Hemel writes: Having aligned half of the Armature to the robot, we look at symmetrizing the Armature and parenting the rigid robot parts to the bones, as well as recalculating the bone roll.
from BlenderNation https://www.blendernation.com/2021/09/28/robot-rigging-part-2-parenting-to-bones-symmetry-and-bone-roll/
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