A corner drive assembly for a locking system of a window comprising: a case; a corner insert; a corner transfer spring; a first arm; and a second arm; the case configured to be mounted to a window frame and comprising a first leg substantially aligned with a first axis and comprising a first interior compartment; a second leg substantially aligned with a second axis perpendicular to the first axis and comprising a second interior compartment; and a corner portion joining the first leg and the second leg; wherein the corner portion of the case comprises a third interior compartment that is coextensive with the first and second interior compartments; wherein the corner insert is disposed in the case within the third interior compartment of the case, the corner insert including a curved passageway; wherein the corner transfer spring is slidably disposed in the curved passageway of the corner insert and has a first end movable along the first axis and a second end movable along the second axis; wherein the first arm is disposed in the first interior compartment and slidable along the first axis, the first arm being coupled to the first end of the corner transfer spring; and wherein the second arm is disposed in the second interior compartment and slidable along the second axis, the second arm being coupled to the second end of the corner transfer spring, wherein motion of the first arm along the first axis causes corresponding motion of the second arm along the second axis; wherein the curved passageway of the corner insert includes a bearing surface; and a first coefficient of kinetic friction between the corner transfer spring and the bearing surface of the curved passageway of the corner insert is less than a second coefficient of kinetic friction between the corner transfer spring and the first and second interior compartments of the case. a case; a corner insert; a corner transfer spring; a first arm; and a second arm; the case configured to be mounted to a window frame and comprising a first leg substantially aligned with a first axis and comprising a first interior compartment; a second leg substantially aligned with a second axis perpendicular to the first axis and comprising a second interior compartment; and a corner portion joining the first leg and the second leg; wherein the corner portion of the case comprises a third interior compartment that is coextensive with the first and second interior compartments; wherein the corner insert is disposed in the case within the third interior compartment of the case, the corner insert including a curved passageway; wherein the corner transfer spring is slidably disposed in the curved passageway of the corner insert and has a first end movable along the first axis and a second end movable along the second axis; wherein the first arm is disposed in the first interior compartment and slidable along the first axis, the first arm being coupled to the first end of the corner transfer spring; and wherein the second arm is disposed in the second interior compartment and slidable along the second axis, the second arm being coupled to the second end of the corner transfer spring, wherein motion of the first arm along the first axis causes corresponding motion of the second arm along the second axis; wherein the curved passageway of the corner insert includes a bearing surface; and a first coefficient of kinetic friction between the corner transfer spring and the bearing surface of the curved passageway of the corner insert is less than a second coefficient of kinetic friction between the corner transfer spring and the first and second interior compartments of the case.