Changing the Pen in the Pen Cartridge

The pen tool cartridge is unlabeled and is black with a metal pen holder column attached to the base.

The pen icon within the software is a small black stylus symbol. 

Push the blade cartridge release lever to eject the current cartridge.

Turn the pen holder locking screw counter-clockwise to loosen it and slide the pen locking bolt away from the cartridge base.

Remove the existing pen by extracting it from the pen holder.

Replace with a new pen by placing the tip in first and inserting the pen into the pen holder.