A steam turbine drum nozzle comprising: an airfoil; a radially inner sidewall coupled with a first end of the airfoil; and a radially outer sidewall coupled with a second end of the airfoil, the second end opposing the first end, wherein the radially outer sidewall is configured for mounting in a circumferentially extending slot of a surrounding drum nozzle ring and includes: a first section radially outward of the airfoil; a thinned section having a reduced axial thickness relative to the first section, the thinned section coupled with the first section and located radially outward of the first section; and a second section axially thicker than the thinned section, the second section coupled with the thinned section and located radially outward of the thinned section, the second section having a radially outer face which forms the radially outer surface of the radially outer sidewall and a circumferentially facing side which abuts the radially outer face, wherein the second section includes a relief slot extending from the circumferentially facing side and the radially outer face, characterized in that the second section includes a circumferentially extending slot for receiving a retaining pin therein; and the relief slot extends from an approximate axial midpoint on the circumferentially facing side to a location axially inboard of an axially facing surface of the second section. an airfoil; a radially inner sidewall coupled with a first end of the airfoil; and a radially outer sidewall coupled with a second end of the airfoil, the second end opposing the first end, wherein the radially outer sidewall is configured for mounting in a circumferentially extending slot of a surrounding drum nozzle ring and includes: a first section radially outward of the airfoil; a thinned section having a reduced axial thickness relative to the first section, the thinned section coupled with the first section and located radially outward of the first section; and a second section axially thicker than the thinned section, the second section coupled with the thinned section and located radially outward of the thinned section, the second section having a radially outer face which forms the radially outer surface of the radially outer sidewall and a circumferentially facing side which abuts the radially outer face, wherein the second section includes a relief slot extending from the circumferentially facing side and the radially outer face, characterized in that a first section radially outward of the airfoil; a thinned section having a reduced axial thickness relative to the first section, the thinned section coupled with the first section and located radially outward of the first section; and a second section axially thicker than the thinned section, the second section coupled with the thinned section and located radially outward of the thinned section, the second section having a radially outer face which forms the radially outer surface of the radially outer sidewall and a circumferentially facing side which abuts the radially outer face, wherein the second section includes a relief slot extending from the circumferentially facing side and the radially outer face, characterized in that the second section includes a circumferentially extending slot for receiving a retaining pin therein; and the relief slot extends from an approximate axial midpoint on the circumferentially facing side to a location axially inboard of an axially facing surface of the second section.