A method of supporting a part with particulate shape retaining media, the method including placing the part on a bed of the particulate shape retaining media, fluidizing the particulate shape retaining media until the part penetrates therein, and vibrating the bed of particulate shape retaining media to compact the particulate shape retaining media around the part. A drawer frame track is located on the drawer frame for slideably receiving the drawer roller. A bar code is assigned to each trap for identifying it. An error estimator estimates errors in the navigation measurement data of the slave navigation component based on the displacement information. When the height adjustment mechanism is locked, the means for absorbing shock enables temporary displacement of the backboard in response to imposition of a load or force on the backboard if the imposed load or force exceeds a threshold load or force, respectively.