The present application relates to an apparatus and methods of positioning an object using an adjustment block. In the preferred embodiment, the support device is selectable between at least a tray support and an armrest position. The access port receives the blunt cannula to couple and aseptically transfer medical and body fluids. The write head is moved, using the servo track writer, at an actual velocity trajectory to simulate writing one spiral of spiral servo information. The curtain assembly may be used as part of various larger assemblies and in various environments.