This clutch could be worn towards the extent which the brushroll experiences tiny to no spinning. In cases like this you might have to replace the clutch - see video down below. Replacing motor brushes is a reasonably regime servicing treatment but is best carried out by an expert http://vacuum-center-boulder62592.tinyblogging.com/The-Fact-About-hepa-vacuum-bags-boulder-That-No-One-Is-Suggesting-34866544