Abstract: Apparatus for treating flooring surfaces, the apparatus includes a drum assembly which provides counter-rotation of the drum assembly relative to the direction of rotation of the surfacing discs to provide improved handling characteristics. The apparatus also includes a frame with leg structures that pivot relative to the frame and of adjustable height to facilitate maintenance tasks, such as replacement of surfacing disks. A handle structure is also included that can be configured in a variety of positions and adapted to assist with maintenance tasks such as motor removal.