Three dimension memory arrays and methods of forming the same are provided. The device to be installed is supported in a holder or shell. A rigid measurement bar of sufficient length is positioned in the leveling direction between the upper and lower rolls, extending over all the rolls, and having rigid protrusions integral with the bar reproducing, when they are placed plumb with the lower rolls, the action of the lower rolls and their mechanical properties. The received location data is recorded in a routing table. The present invention also is capable of determining a spatial location of the display by observing a pattern presented on the display and using well-known correlation techniques.