These nuts are squeezed into round, punched or drilled holes in sheet metal between a parallel punch and flat anvil. The nut is flush or less on the back side. No special hole preparation or tooling ...
Image: David Jakins, the World Conker Championships winner, denies cheating and says he had the steel nut on him for 'humour value' The World Conker Championships is investigating after the men's ...
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