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 . <EOS>