A rotor assembly comprising: a rotor having a dovetail slot, the dovetail slot including a plurality of recesses and a first radially innermost surface; a shim including a thick end, an opposing thin end, and a thinned region extending from the thick end; and a rotor blade having a platform, an airfoil extending radially outward from the platform, and a dovetail extending radially inward from the platform, the dovetail including a plurality of projections extending in opposite directions that are received by the plurality of recesses of the dovetail slot, the dovetail comprising: a leading edge surface; a trailing edge surface; a second radially innermost surface; and a groove defined along the second radially innermost surface from the leading edge surface to the trailing edge surface, wherein the shim is positioned within the groove and between the first radially innermost surface and the second radially innermost surface, and wherein the shim extends at least partially radially along both of the leading edge surface and the trailing edge surface, wherein a first corner is defined at an intersection between the leading edge surface and the second radially innermost surface, and a second corner is defined at an intersection between the trailing edge surface and the second radially innermost surface, wherein the first corner and the second corner are arcuate, and wherein the first corner is axially recessed relative to the leading edge surface, and the second corner is axially recessed relative to the trailing edge surface. a rotor having a dovetail slot, the dovetail slot including a plurality of recesses and a first radially innermost surface; a shim including a thick end, an opposing thin end, and a thinned region extending from the thick end; and a rotor blade having a platform, an airfoil extending radially outward from the platform, and a dovetail extending radially inward from the platform, the dovetail including a plurality of projections extending in opposite directions that are received by the plurality of recesses of the dovetail slot, the dovetail comprising: a leading edge surface; a trailing edge surface; a second radially innermost surface; and a groove defined along the second radially innermost surface from the leading edge surface to the trailing edge surface, wherein the shim is positioned within the groove and between the first radially innermost surface and the second radially innermost surface, and wherein the shim extends at least partially radially along both of the leading edge surface and the trailing edge surface, a leading edge surface; a trailing edge surface; a second radially innermost surface; and a groove defined along the second radially innermost surface from the leading edge surface to the trailing edge surface, wherein the shim is positioned within the groove and between the first radially innermost surface and the second radially innermost surface, and wherein the shim extends at least partially radially along both of the leading edge surface and the trailing edge surface, wherein a first corner is defined at an intersection between the leading edge surface and the second radially innermost surface, and a second corner is defined at an intersection between the trailing edge surface and the second radially innermost surface, wherein the first corner and the second corner are arcuate, and wherein the first corner is axially recessed relative to the leading edge surface, and the second corner is axially recessed relative to the trailing edge surface.