Examine the marker. Determine the type of material from which it is made.
Practice on some scrap plastic or scrap metal, depending on the marker. If your marker is metal, then find scrap metal. If your marker is plastic, then use scrap plastic.
Clamp your scrap material to your work bench by using one or two C-clamps. Put on your protective goggles before you begin your work.
Power on your engraving pen. Practice with different strokes and depths on your scrap material.
Choose the spot on the marker that you would like to engrave when you feel comfortable with your practice runs.
Use a pencil to gently sketch the engraving that you would like to complete.
Fold a piece of cloth around the top and bottom ends of the marker. This helps to protect it when you use the C-clamp.
Clamp the top and bottom ends of the marker to your work bench or table. Power on your engraving pen.
Slowly and carefully engrave the picture or letter that you would like to appear on the marker.