How do I get this pen to work? Never used, filled it with ink, but it wont write. Staedtler mars matic technical pen : r/pens

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How do I get this pen to work? Never used, filled it with ink, but it wont write. Staedtler mars matic technical pen : r/pens

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How do I get this pen to work? Never used, filled it with ink, but it wont write. Staedtler mars matic technical pen : r/pens