 A detailed description of how to dismantle and reassemble the system was contained in the two-volume Navy Ordnance Pamphlet OP 1140 with several hundred pages and several hundred photographs.When reassembling, shaft connections between mechanisms had to be loosened and the mechanisms mechanically moved so that an output of one mechanism was at the same numerical setting (such as zero) as the input to the other.Fortunately these computers were especially well-made, and very reliable.