A crankshaft includes a plurality of crankpins. A riding strip fabricated of an elastomeric material extends over the upper surface from tapered end edge to tapered end edge. Each cycle may be performed at a pressure greater than atmospheric pressure, or a temperature greater than 20 degrees centigrade, or both. The particle is then presented to a target that generated the access request. The driving elements have a cam control surface that causes the individual bristle support segments to execute an additional movement superposed upon the movement of the bristle support. During installation, the tapers center the rotor and bullet pins center the frame.