Herein is presented a catadioptric projector by combining a commodity digital projector with additional optical units. A jacking device is releasably attached to a locking plate that presses against an inferior aspect of the head to rotate the head into anatomic alignment. The method further includes the steps of placing an inner layer of non-porous material within the outer layer such that an underside of each fastening element is positioned between the inner layer and the outer layer and laminating the outer layer to the inner layer to form the non-porous tubular graft. The optical receiving port includes an optical arrangement for receiving the alignment beam and focusing it on a projection screen located inside the housing. Methods for utilizing the dependency records and the above described software components to determine whether a content page is out of date are also disclosed .