cable construction progress finally began. However, a few months before in July 2011, the tower head was lifted and placed over the saddle in a test fitting and was then removed to allow the laying of the cable. Later on in 2012, the cables were fully placed on the tower saddle and were then anchored throughout the whole SAS span. The tower head was then permanently installed for the final time, along with aircraft warning beacons, completing the entire SAS tower at a final height of . SAS main suspension cable The tower saddle includes eyebars for the attachment of temporary cables that supported four walkways, each a simple suspension bridge (called a catwalk) that allowed access to the cable spinning mechanism and the main cable during construction. In several ways similar to a ski lift, additional superior cables carried one or more of these travelers, wheeled devices that shuttled from one end of the span to the other, pulled by drafting cables manipulated by several winches. The main span uses a single cable, spun using pre-bundled groups of wires from an anchor point at the eastern end of the main span, across an eastern corner horizontal deviation saddle, over a vertical deviation saddle on the eastern end, up and over the corresponding half of the main tower saddle, down to a 90-degree deviation saddle at the western counterweight, across the counterweight, passing over the hydraulic tensioning saddle, around the opposing western deviation saddle, up to the other half of the main tower saddle, over an eastern vertical deviation saddle down to the final eastern corner deviation saddle, to the appropriate anchor point in the eastern strand anchor opposite the beginning. As a bundle is laid down, it was initially supported by supports mounted on the catwalk, then both ends were attached and the cable is tensioned at the eastern anchor points. As with a conventional cable suspension span, all of the tensioned bundles were then compressed into a circular shape and protected with a circular wrap of wire. Saddles for suspender cables were added and suspender cables placed and tensioned. The suspender cable tensioning lifted the span from its supporting falsework. In mid-June 2011, preparations for the spinning of the main cable began by installing the temporary catwalks on the SAS span. Both western catwalks were installed and by mid-August, all four catwalks were installed in place and an