A shelf assembly includes a shelf pane having perimeter edges. An apparatus disclosed herein includes a steering drum to rotate about a longitudinal axis in a first direction and a second direction different than the first direction. The article of manufacture comprises a program storage device tangibly embodying program steps executable by a computer for performing the foregoing method steps. The composition can be used as an antiperspirant andor deodorant when applied to an axillary area of a person. In combination, the inner seal and the waveguide extension tend to increase efficiency and decrease audio distortions of the transducer.