Afterward, two separate companies constructed the modules that would make up the suspension towers. The Staten Island tower was built by Bethlehem Steel, and the Brooklyn tower was built by the Harris Structural Company. The first piece of the towers, a 300-foot piece of the tower on the Staten Island side, was lifted into place in October 1961, and this tower was topped out by September 1962. The Brooklyn tower started construction in April 1962. When the towers were fully erected, workers began the process of spinning the bridge's cables. The American Bridge Company was selected to construct the cables and deck. The cable-spinning process began in March 1963, and took six months, since of bridge cables had to be strung 104,432 times around the bridge. The main cables were hung on both sides of the span, and then suspender cables were hung from the bridge's main cables. The main cables were fully spun by August.