A system that includes a bus, a battery, core processing circuitry, radio frequency processing circuitry, first power regulating circuitry, second power regulating circuitry, and control circuitry is provided. A slip resistant pad material is disposed on opposing faces of the frames for providing a soft, slip resistant surface for engaging the slats. A distal portion of an upper arm of each ejector latch lies on opposite sides of the plane, such that the ejector latches interleave when either ejector latch is pivoted to an open position. Furthermore, the supply tube extends at least partially in the direction of the rotation axis of the distribution chamber, and the sleeve is designed such that it can rotate with respect to the supply tube. A positioning mechanism is connected to the housing and makes the position of the housing change along the rotation center axis at each angular position around the rotation center axis. The contact portion is axially spaced from the base member by an axial gap.