albertaduke
former airline pilot without the big bucks
That nut should spin freely if you have the castle/motor miunt nut loose as it is on the other end of the bolt.
I am talking about the nut on the bearclaw side ,rear upper mount , there is no castle motor mount nut on that attachment there . I cannot even take a picture it is so buried behind wire and stuff !!!! I will go back and take a fresh look ,I snoozed for a while today did not sleep too well.