Why do ball pens have a spring attached inside their outer covering??
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because the refill is very thin. also in clicking pens for clicking is used
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Pressing the tip of the pen on the writing surface causes the ball to roll. This rolling action then transfers ink from the inside of the pen to the writing surface. ... Here a small spring is attached to the outside of the ink reservoir, and when a button is pushed, the point is either exposed or retracted.
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