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Creata pagina con "Also in this case there is an unscrewable bottom that is hooked to a metal cylinder that slides hermetically thanks to a gasket along the body of the pen, the mechanism is how..."
Also in this case there is an unscrewable bottom that is hooked to a metal cylinder that slides hermetically thanks to a gasket along the body of the pen, the mechanism is however much more complex to avoid the use of the ventilation hole on the bottom of the pen and allow compression only by pushing down the tube anchored to the bottom once you have extracted it.