Adhesive paste of polymer resin, fugitive liquid and particulate filler with round edges provides improved performance characteristics. The hinged together platforms convert from a fully adjustable chair mode to a bed mode by a first jack located beneath the seat platform. In another aspect, an overlay target with gratings or box-in-box structures is illuminated and radiation scattered by the target is imaged onto detectors located away from the specular reflection direction of the illumination in a dark field detection scheme. The inner and outer tubes have proximal distal ends.