hello everyone i need some help some drive pully come off and some are a bit harder than others , but i have one now that won't budge . i have tilted the machine forward and sprayed some wd40 in it and also tapped on the rivets of the case on the drive pully left t repeted the process but still won't come off . what are your suggestions ? is there a tool that i can use for stuck on drive pully wheels on dyson cr01 thanks jason.