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The best battery shutoff switch are made be Cole Hersee, Boston MA. Virtually every race car has one, and I have one on both A's. The are not pot metal, they are a steel housing, with a switch knob the operates a positive, spring loaded, internal detent contact system. I do not know what the contact material is, but you can assume it is brass or copper. You can get the specs from Cole-Hersee. They used to be made in South Boston, but more likely in Mexico today. Be sure to switch the ground side. No ground, no juice, anywhere.