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Paste the center dial onto a piece of board, or laminate in plastic, and cut out the circle, then attach it to the calculator with a brad or thumbtack in the middle, so it can spin freely. |
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Paste the center dial onto a piece of board, or laminate in plastic, and cut out the circle, then attach it to the calculator with a brad or thumbtack in the middle, so it can spin freely. |
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