Remove glue from glue stick. Also remove the plastic spine that sits in the middle of the stick and holds the glue in place. Rinse the container out thoroughly.
Roll a ball of Blu Tack and insert it into the glue stick container. Press the Blu Tack down firmly to the bottom of the interior of the glue stick container with a pen.This is to prevent ink leakage.
Fill the glue stick container about a third of the way with paint thinner. The more thinner you use, the more drippy your ink is going to be when you use the pen.
Fill the glue stick container another third of the way with ink.
Set the glue stick container aside and cut out a section of the soft cloth-like material from the blackboard eraser. The section cut out should be about 5x1x1/4 inches.
Roll the eraser cloth like a carpet as tightly as possible and insert it into the glue stick container. It should be a snug fit. Once inserted, the top of the cloth should extend just slightly beyond the top of the glue stick container.
Shake the pen vigorously and hold it upside down for a while to allow the ink to reach the surface of the pen.