A turbine machine comprising: a rotatable shaft ; a nose cone having a central axis (A) mounted to said rotatable shaft via a coupling flange so that said central axis (A) 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 (A), 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 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 (A) mounted to said rotatable shaft via a coupling flange so that said central axis (A) 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 (A), 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 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 . <EOS>