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

My grandad recently passed and left me all of his art supplies. I've recently been on a mission to get refills for all of his pens but these two have thrown me a bit. If anyone knows what they are or how to refil them I'd appreciate it : r/pens

Staedtler Marsmatic Pen / Replacement Nibs - Different Sizes - Technical Pen

How To Unclog Technical Pens (Hint: Don't Shake!)

This pen is not filled with ink. Ink is 745R - 9 of filling type or 745R - 009 of one touch. It is in the item of marsmatic ink. Built-in spring seal, the double cap completely protects the pen tip from outside air, and it completely prevents clogging by drying.

Staedtler Mars Matic 700 M018 Technical Pen - 0.18 mm

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Staedtler Marsmatic 700 S7 Technical Pen Set

Why are most stationery companies that sell pens and mechanical pencils seem to be owned by Japanese companies, like Zebra, Pentel, Pilot, and Sakura? - Quora

Staedtler Mars Matic 700 M013 Technical Pen - 0.13 mm

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