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Plumbeeper is the man to consult, but the process begins with the trickiest part: removing the center cap by prying it off CAREFULLY from the edges with a slim plastic trim prybar or similar tool (those hex nuts in the cap are fake!) and then removing the large center nut on the end of the shaft down inside the crush can, disconnecting the wire, and then either using a puller, or if its not on too tight sometimes you can pull it off by hand, but most likely a puller will be needed.