the clutch hub includes a sheet - metal hub member which has an axial member projected from the center of its plate surface , and also includes an annular armature which is fixed to an outer peripheral portion of the axial member . first mounting the axial member of the clutch hub downward on a support member and thereby elastically supporting the end surface of the armature by the support member ; holding the axial member of the clutch hub using a chuck ; locating a fixing member just under a portion of a maximum runout portion of an inner hub ; contacting a cylindrical end surface of a pressing member with an upper surface of the inner hub using pressure ; and plastically deforming the inner hub by a pressing force of the pressing member using the locating portion of the fixing is member as a fulcrum , which thereby corrects an inclination of the axial member .