try ti figure it out from here https://www.brit-car.co.uk/product.php/83453/1217/sump_plug_washer_td5_defender___discovery_2
I was taught to heat copper until it was cherry red and then plunge into cold water. Still works for me.(heat it right up and let it cool naturally )
Not good IMO... afaik it's better to let it cool by itself... that cold water thing works for iron or steel, though i'm not a metalurgistI was taught to heat copper until it was cherry red and then plunge into cold water.
Not good IMO... afaik it's better to let it cool by itself... that cold water thing works for iron or steel, though i'm not a metalurgist