After the structure was assembled and finessed into the correct position the sail was placed loosely in position. The sail is hi-tech, Teflon coated, fire retardant fabric that should last 20 years or more. A 10mm steel cable is built into the entire perimeter of the sail so it can be tensioned.
You can see here that the stainless tension bolts that attach the sail to the structure are quite long. They are repeatedly tightened in sequence until the entire sail is extremely taut. Then the tail of the bolt is cut off and a lock nut put on.
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