Question

WHAT IS THE USE OF THIS PART OF THIS PEN??​

Answer 1

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It is used to refill the pen mostly... Like if your refill is over but it may also be that this is just for decoration and the refill thingy may be at the very end.

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Just move it around. If it doesn't happen so just Google lens it and see it's name... Lastly search how to refill it on Google. Easy like a piece of cake, right

Answer 2

This is an ink pen so the ink is stored in that post of the pen when you write I will supply ink