Abstract: An adjustable holder assembly for positioning a vacuum chuck relative to a bed including a base plate having an integrally formed pivot mount for rotatably affixing the plate to a bed providing a first degree angular displacement .theta.1. A lower stage includes a housing having bearing ways formed on the bottom of said housing spaced to slidably mate with the tracks in the base plate, a lead screw extending through said housing and a concentric shaft with cord means encircling said shaft, the lower stage housing having substantially parallel tracks formed in the top surface at right angles to the bottom surface ways.