A turbine machine comprising: a rotatable shaft; a nose cone having a central axis mounted to said rotatable shaft via a coupling flange so that said central axis is axially aligned with said rotatable shaft, said nose cone comprising a flange extending axially from a leading tip of said nose cone to a trailing edge at a base of said nose cone and radially around said central axis, said flange having an outer surface defining an airflow path and one or more apertures; and a shaft balancing assembly comprising one or more balance weights (132, 232) positioned at least partially in said one or more apertures, one or more of said balance weights (132; 232) being removable from said apertures while said nose cone is mounted to said shaft, wherein said flange is formed with a thickness that does not vary by more than fifty percent from said leading tip of said cone to said trailing edge of said flange, and wherein said shaft balancing assembly further comprises one or more alignment modules, each alignment module comprising an alignment module recessed cavity adapted to receive at least a portion of the balance weight and each alignment module defining an alignment module bore adapted to receive an elongated fastener, the one or more balance weights (132; 232) retained within the module recessed cavity by the elongated fastener, each alignment module being dimensioned to be removably located and abutted against the coupling flange, said one or more alignment modules adhering to an inner surface of said flange and being positioned so that the alignment module bore is aligned with a flange aperture to thereby form an aligned pair of a flange aperture and a module bore, each of said aligned pairs forming a recessed cavity. a rotatable shaft; a nose cone having a central axis mounted to said rotatable shaft via a coupling flange so that said central axis is axially aligned with said rotatable shaft, said nose cone comprising a flange extending axially from a leading tip of said nose cone to a trailing edge at a base of said nose cone and radially around said central axis, said flange having an outer surface defining an airflow path and one or more apertures; and a shaft balancing assembly comprising one or more balance weights (132, 232) positioned at least partially in said one or more apertures, one or more of said balance weights (132; 232) being removable from said apertures while said nose cone is mounted to said shaft, wherein said flange is formed with a thickness that does not vary by more than fifty percent from said leading tip of said cone to said trailing edge of said flange, and wherein said shaft balancing assembly further comprises one or more alignment modules, each alignment module comprising an alignment module recessed cavity adapted to receive at least a portion of the balance weight and each alignment module defining an alignment module bore adapted to receive an elongated fastener, the one or more balance weights (132; 232) retained within the module recessed cavity by the elongated fastener, each alignment module being dimensioned to be removably located and abutted against the coupling flange, said one or more alignment modules adhering to an inner surface of said flange and being positioned so that the alignment module bore is aligned with a flange aperture to thereby form an aligned pair of a flange aperture and a module bore, each of said aligned pairs forming a recessed cavity.