A damping element includes: two spring elements which are coaxial with or parallel to a longitudinal axis and two axially end-side connectors, where the first spring element exhibits a spring rate F, the second spring element exhibits a spring rate f, and the spring rates F and f are different. The method includes: multiplexing the channelization-code-set information, the modulation-scheme and number of transport blocks information and the precoding weight information to give a sequence of sixteen bits x1,1, x1,2,. An aft hub couples the stack to the shaft. The upper and lower sliders respectively have first sides thereof facing towards each other and second sides thereof being slidable along upper and lower sidewalls of the shell, each one slider having two metal contacts provided on the first side thereof corresponding to the contacts of the stationary port. Furthermore, by the addition of internal voids, the wafer reduces or eliminates the lateral propagation of acoustic energy through the wafer.