We would also propose lubricating the bearings As you hold the brushroll out. Immediately after cleaning/lubricating be sure that the brushroll spins freely. If it continue to will not move freely then you'll have to replace the bearings or the entire brushroll. See video beneath. If the ability brush http://vaccumrepairboulder39505.tinyblogging.com/Rumored-Buzz-on-vacuum-fixed-boulder-34773726