I recently picked up a Twsbi Kai, but I noticed that the section where you grip the pen is loose. It wiggles, and I am not sure how to fix this problem?

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Piston Filler Type fountain pen. Simply twist the end knob open and closed to fill the pen with ink. Acrylic cap, grip, body, end cap. RoseGold nib,

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My new Twsbi Eco EF nib is sliding as I'm writing, and I have to

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TWSBI Go Review: The Perfect Fountain Pen for Someone (Just Not Me