Abstract: A toner drum gear flange socket adapted for engagement with a force transmitting end of a drive shaft in an electrophotographic image forming apparatus. The socket includes a bottom wall and an outer cylindrical wall including an inner surface and defining a central axis. Circumferentially spaced apart curved base wall portions extend axially from the bottom wall. Each base wall portion includes an enlarged end portion that defines a radially inwardly extending projection. A leg wall portion extends radially from one end of each curved base wall portion. Each leg wall portion defines an elongated contact surface. The radially inwardly extending projections secure the force transmitting end of the drive shaft within the socket, and the elongated contact surfaces receive driving rotational force from the force transmitting end of the drive shaft.