if you are still trying to get the nut off from the center of the clutch, the trick i always used was to just put all the clutch friction plates and steel plates in where they need to be, andwithout the pressure plate installed, put pressure on the outer disc with your finger and hit the nut with an impact wrench. the pressure on the clutch discs is typically enough to do the job of a clutch holder. its always worked for me