A method of manufacture of a bis composition includes reacting, in the presence of a solvent and a catalytically active amount of an imidization catalyst selected from quaternary ammonium salts, quaternary phosphonium salts, and combinations thereof, a substituted phthalic anhydride with an organic diamine, wherein conversion to the bis is 99% complete in less than 6 hours. In order to damp the mast oscillations occurring during movement, at least one friction roller is provided that rolls on the guide rail and an eddy current brake is provided that is driven by the friction roller. The method may also include monitoring access to each object to determine a frequency of access for each object.