Interesting story. My Dad worked in Irish Pioneer Works in Cork, galvanising steel. They won the contract to galvanise the pylons for the original Dart, as they had a longest molten zinc bath in Ireland. But the pylons were so long, they had to double dip them. He's still alive and very proud of the fact that the vast majority of the DART pylons still in use were dipped by him in the late 70's.