Stylus

Here's what the inside of the Doodle Pro stylus looks like. The tip is spring loaded, and contains a small magnet (Alnico?) at the tip, held in a brass adapter. The green string on the back side tethers the stylus to the display panel. This is part of the Evil Mad Scientist Analog PlotBot project, which features a DIY E-Paper display! Read more about this project here.