My Aunt Doris just gave me her old Kirby vac that she got in 1950. I want to make sure I pack it up properly for the ride home (750 miles), and I can't figure out how to remove the handle and the bag assembly. There is a knurled nut that I tried to unscrew, but didn't seem to want to come off. Removed the Sani-emptor cover, but couldn't figure out how to get the bag assembly off either. She has the instruction book, but we can't find it. I don't want to break anything, so I'd greatly appreciate any help.