In the present invention, by selecting an optimum combination of plating layer materials or materials, not only the manufacturing cost of motor brush is reduced but also a plating layer having excellent characteristics is formed in a narrow width on the surface of brush base material so as to have a predetermined thickness. The flexible mold is cast from a master tool machined from soft metal using a relatively low precision machining process, with relatively higher precision surfaces being defined by a precision formed insert incorporated into the master tool. In one embodiment, a spring 66 urges the rib into contact with the notch to tension the stud and clamp the panel to its support.