A rotor assembly for an electric generator, comprising a rotor element, conductive rotor windings and a plurality of rotor slot wedges. The rotor element comprises rotor teeth and rotor slots. At least a first rotor slot wedge is in a first rotor slot and has a shape that encompasses a rectangular prismatic shape and first and second protrusions. At least a first edge on an end surface of at least a first rotor slot wedge has a degree of smoothness as specified herein, and/or is radiused (as defined herein). Also, methods of refurbishing an electric generator, comprising radiusing at least a portion of at least one edge of a wedge. Also, removing a wedge from rotor element, radiusing at least one edge of the wedge, and inserting the wedge into a rotor element.