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Key to attaching was to have a timer act as a function group. Once you had lined up the new part with rotors that are going to act as a joint. Set the timer group to attach rotor heads AND immediately turn off the rotor blocks. This way there's no torque anywhere and the rotors don't do anything.
In these builds the pistons do ALL the work, rotors do nothing but act as joints.
It would be difficult though...