Abstract: A fluid-resistant brush holder assembly having a hollow metal cylinder body with internal threads at a first end and a second end forming a brush channel. An electrical connector having a first portion is mechanically and electrically connected to the body. A connecter tab extending away from the electrical connector is provided for making contact with an electrical power source. The outside surface of the body and the first portion of the connector are encapsulated in a molded nonconductive material. The molded nonconductive material provides the connector with structural rigidity and fixed orientation with respect to the body. A metal threaded cap having a hollow interior is provided for screwing into the interior threads in the body and capping the first end of the body. The head portion of the body cap seats against the body to seal the first end of the body. A brush cap is fitted into the hollow interior portion of the body cap.

Abstract: A wafer spinning assembly for use in wafer processing includes a chuck for holding a wafer, a vertically oriented spindle connected to drive the chuck, and a spindle drive motor. The spindle drive motor includes an enclosed cylindrical housing which is enclosed on a top end with a top end cap having an outside surface impermeable to infiltration by wafer processing solutions. A drive shaft is mounted inside the housing for rotational movement and out an unsealed aperture in the top end cap. A motor mounted inside the housing provides electromotive rotational force to the shaft in response to electric power supplied to the motor through a plurality of brush assemblies. The top end cap includes a cylindrical collar portion extending outwardly from the outside surface, oriented generally horizontally, of the top end cap and around the shaft. The motor is deployed so that the shaft is actually aligned with the spindle.