The only problem with that time trial is it’s not reality. There will be debris and crop juices all over in that header to fall into the cutter deck when it gets opened up. Gotta pressure wash that thing first, then pull the turtle off and then pressure wash it again. Press the old hub off the broken shaft, press the old bearing out of the hub, clean the hub thoroughly, put new bearing in hub, press bearing on new shaft, then reinstall.