A computer-animated graphical model visually conveys the movement and vibration of an entire shaft rotating within its bearings, and the behavior of the shaft at each individual bearing. These staircase waveforms can be realized by adding at least two pulses. Engagement legs may extend from the retaining tabs, and a bracing T-post may be fit between the engagement legs and pinned therein by insertion of brace engagement fasteners. A second wall of the pair of dividing walls is positioned generally between the first wall and the top wall. If the conditional limitations are met, the designated element may be immediately freed from memory.