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Hello there. I worked at Metalbox Box when it closed down back in the 80's and I remember you dad Bill. He worked on the snow grinder a massive horizontal surface grinder that gave  up so much spray its was like snow. Big set fella bald head if I remember right. We knew him Kojak the machine was next to the main door to the factory. My father Syd worked in the stores too
I will attempt to send you a photo of the turning section .

There's always  someone who  knows someone.
Regards Bob Wilson