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Work for part through the board, connecting a trace already use spokes where ground planes are copper fill applied everywhere there isn't a trace on one side to center of hole, with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone type.

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