A main field wound assembly for an electric generator, the main field wound assembly comprising: a rotor core assembly; a first end winding support coupled to a first end of the rotor core assembly; a second end winding support coupled to a second end of the rotor core assembly axially aligned and opposite the first end of the rotor core assembly, the first and second end winding supports each comprising a pair of winding lead supports formed on opposite sides of a winding slot and separated by an upper slot width, each of the winding lead supports comprising a winding channel routed between a lead coupling port and the winding slot, the winding slot comprising a base support and a pair of alignment members that define a transition between the base support and the winding lead supports, wherein a lower slot width is defined along the base support between the alignment members and a ratio of the upper slot width to the lower slot width is between 1.024 and 1.053; and a coil of wire repeatedly wound about the first end winding support, the rotor core assembly, and the second end winding support; characterized in that the base support of each of the first and second end winding supports further comprises a plurality of grooves aligned along an edge of the base support between the winding lead supports, the grooves establishing a spacing constraint for a first layer of winding the coil of wire; and wherein each of the winding lead supports further comprises a shim support groove having a shim support width and a shim support depth, and a ratio of the shim support width to the shim support depth is between 32.94 and 48.34; and wherein the shim support width is defined orthogonal to the upper slot width and the lower slot width on each of the first and second end winding supports. a rotor core assembly; a first end winding support coupled to a first end of the rotor core assembly; a second end winding support coupled to a second end of the rotor core assembly axially aligned and opposite the first end of the rotor core assembly, the first and second end winding supports each comprising a pair of winding lead supports formed on opposite sides of a winding slot and separated by an upper slot width, each of the winding lead supports comprising a winding channel routed between a lead coupling port and the winding slot, the winding slot comprising a base support and a pair of alignment members that define a transition between the base support and the winding lead supports, wherein a lower slot width is defined along the base support between the alignment members and a ratio of the upper slot width to the lower slot width is between 1.024 and 1.053; and a coil of wire repeatedly wound about the first end winding support, the rotor core assembly, and the second end winding support; characterized in that the base support of each of the first and second end winding supports further comprises a plurality of grooves aligned along an edge of the base support between the winding lead supports, the grooves establishing a spacing constraint for a first layer of winding the coil of wire; and wherein each of the winding lead supports further comprises a shim support groove having a shim support width and a shim support depth, and a ratio of the shim support width to the shim support depth is between 32.94 and 48.34; and wherein the shim support width is defined orthogonal to the upper slot width and the lower slot width on each of the first and second end winding supports.