Temporarily undo the bolts supporting the center bearing. This will allow the prop shaft to bend and give you some more room to squeeze the disk in. You may also have to undo the exhaust system so the prop shaft can "fall down" far enough...that's what I had to do. Then redo everything back to the way it was once the disk is in place, first the center bearing support so the prop shaft is in its proper position, then tighten the guibo nuts/bolts. HTH