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Hammer headers
You can purchase new hammer headers from a number of different retailers. Both Pimoroni (https://shop.pimoroni.com) and Pi Hut (https://thepihut.com) have them listed, and both companies ship to a wide range of countries.
If you choose to use the hammer headers, please ensure that you follow all of the instructions from the supplier or you risk irreparably damaging your Raspberry Pi computer!