yaml file with 2 parallel servos [closed]

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Hi, i have bought a PhantomX Reactor robotic arm that i am using in a ROS environment with the arbotix_python package and i need a YAML file to define my robot. I got a problem because in order to be stronger, two of my joints have two servos in parallel, they are then dependent each other. How do I describe this feature in my yaml file? It seems that each servo has each its own controller and i do not want to take a risk of breaking the robot trying movements. Every advice is welcome! Thanks in advance.