[[File:PressFitPenAssembly.jpeg|thumb]]Pens typically are assembled once the tubes are finished and polished by pressing hardware into each end of the tube and then screwing the necessary parts together. Care must be taken to follow the instructions. Often, it is easy to forget to install a part, or to press the wrong part into a tube.
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The easiest method to do this assembly is to use a shop vise. Cover both jaws with cardboard to prevent scratching or deforming the pen part.<br clear=all>