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What makes a retractable pen retract? What are all the parts called, not just the ballpoint and spring part?

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I'm trying to write a lesson on retractable pens where the students will disassemble a retractable pen, but am having problems finding all the information I need. Please help me!

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  1. The part that holds the ink is called the cartridge.

    The part you hold, that the cartridge is inside of, is called the barrel.


  2. Maybe this will help get you started:

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