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Major works were needed on the Paisley side after the giant bearings failed
The total weight of the steel is 11,700 tons - include 1,250 miles of galvanised wire
The deck moves depending on the temperature and the piers are diamond shaped to allow air in
It carries four water mains and originally two gas pipes
The bridge cost £10.5 million - but by the time it was 30 it had taken in £72million in tolls