the precision assembly table in a particularly preferred embodiment the screw 14 pitch yields a 5 0 mm five millimeters or less elevation change per a 360 degree rotation the precision worm gear 11 preferably has a reduction ratio of 100 1 or greater the electric servo motor 12 is preferably controlled to plus or minus 15 degrees in rotation most preferably by computer input thus by way of example for a one degree rotation of the electric servo motor 12 the adjustment in the height of the rigid bar 3 above the surface 2 would be 0 013 mm as a further example for a one twenty fourth of one degree rotation the adjustment would be 0 000579 mm many other screw 12 pitch precision worm gear 11 reduction ratios and electric servo motor 12 rotations are therefore possible as the foregoing indicates in the most preferred embodiment the rigid bars 3 are square or slightly rectangular shaped in cross section the top surface of the rigid bars 3 are shaped as elongated rectangles as are the sides and bottom of the rigid bards 3 other shapes for the rigid bars 3 are possible and contemplated provided that a surface is provided on which the items to be assembled can be positioned preferably an item such as the guide plate 5 of a magnetic levitation vehicle guideway depicted in fig1 is positioned on and rests on the plurality of rigid bars 3 the guide plate 5 or other structure positioned on the rigid bars 3 is held in position by a hold down fixture such as a clamps at various locations on the guide plate 5 or other structure.