Removing the pulley from the shaft on a hoover

Removal of the pulley requires extreme care. There is a small opening on the side of the black motor housing to allow a special tool (or a screwdriver) to fit on a slot on the armature to keep it from rotating while the pulley is unscrewed. You MUST NOT touch the magnet wire on the armature. If you nick or break it, the motor may fail.
The only other method requires the motor case to be seperated to permit you to hold the armature while unscrewing.