im not sure what kind of clutch is on the mammoth but if it has one continous spring wrapped around the shoes then the shoes and everything should just slide off. unless there is an e-clip holding it on. if there is then take it off and try sliding it off. if it has individual springs on each shoe then you can pry a small screw driver between the clutch nut and slide the shoe off. and the flyweel is just held on w a nut.