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Copper Grinding Type

2006326for a 1 off, get your copper block flat, with hammer or lathe etcand get some 6mm or 14" dead soft pure aluminium sheet 30cm x 30cm, some thicker cloth such as felt or windcheater material to carry the sheet and some chip board to carry the lot then use some automotive valve grinding paste, then rub the copper block in small circles over.

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