Hi George...
My U2602 has a snapped off carbon brush door and bizzarley, the armature is bent, it is only VERY slightly bent but is enough to make it sound like a World War ll airraid siren!! It is very possible that it has always been like that since the moment it came out the box, as we all know that Hoover churned out thousands of Turbopowers so there probebly wasn't time for precise manufaturing (as they made the motors and everything up until the late 90's).
I am not sure wheather to get a new motor or new cleaner, not sure yet.
Alex.