A method for removing an inner casing from a machine having an outer casing, and inner casing within the outer casing, a rotor within the inner casing, the rotor having a longitudinal axis, the method including: removing a top part of the outer casing, removing a top part of the inner casing, removing the bottom part of the inner casing, and, before removing the bottom part of the inner casing: connecting the bottom part of the inner casing to the rotor, such that the bottom part of the inner casing is supported by the rotor, wherein connecting the bottom part of the inner casing to the rotor includes providing a form fitting connection, then rotating the rotor around the longitudinal axis to make the bottom part of the inner casing accessible, characterised in that providing a form fitting connection includes: removing at least one rotor blade from a rotor groove, providing at least one support having a profile corresponding to the profile of the rotor groove at its one end, connecting the support with said one end into the rotor groove of the removed at least one rotor blade, connecting the support with its other end to the bottom part of the inner casing. removing a top part of the outer casing, removing a top part of the inner casing, removing the bottom part of the inner casing, and, before removing the bottom part of the inner casing: connecting the bottom part of the inner casing to the rotor, such that the bottom part of the inner casing is supported by the rotor, wherein connecting the bottom part of the inner casing to the rotor includes providing a form fitting connection, then rotating the rotor around the longitudinal axis to make the bottom part of the inner casing accessible, characterised in that providing a form fitting connection includes: removing at least one rotor blade from a rotor groove, providing at least one support having a profile corresponding to the profile of the rotor groove at its one end, connecting the support with said one end into the rotor groove of the removed at least one rotor blade, connecting the support with its other end to the bottom part of the inner casing. connecting the bottom part of the inner casing to the rotor, such that the bottom part of the inner casing is supported by the rotor, wherein connecting the bottom part of the inner casing to the rotor includes providing a form fitting connection, then rotating the rotor around the longitudinal axis to make the bottom part of the inner casing accessible, characterised in that providing a form fitting connection includes: removing at least one rotor blade from a rotor groove, providing at least one support having a profile corresponding to the profile of the rotor groove at its one end, connecting the support with said one end into the rotor groove of the removed at least one rotor blade, connecting the support with its other end to the bottom part of the inner casing. removing at least one rotor blade from a rotor groove, providing at least one support having a profile corresponding to the profile of the rotor groove at its one end, connecting the support with said one end into the rotor groove of the removed at least one rotor blade, connecting the support with its other end to the bottom part of the inner casing.