Many manuals conflate the "T-Rex 600E" (older, belt tail) with the "600E Pro DFC" (torque tube, rigid DFC head). Ensure your manual’s cover shows the black carbon frame with aluminum side plates and the DFC head design (two rigid arms connecting grips directly to the swash driver).
For more information on the Align T-Rex 600E Pro DFC manual, please refer to the following resources: align trex 600e pro dfc manual