Remove the cap from a jumbo permanent marker pen to expose the writing nib.
Pop the nib portion of the marker off the body. You can use the cap to lever the nib off or you can use a craft knife to cut through the body of the marker.
Remove any ink or paint inside the body of the marker and wash it out. Let the body dry completely.
Stick a pencil down the inside of the nib portion to force the nib out. Wash this part of the marker and let it dry too.
Insert the piece of chalkboard eraser into the hole you removed the nib from. You will have to force the eraser into the piece so only ½ inch of the eraser is sticking out.
Stuff the packaging foam into the nib piece of the marker. The piece should be filled tightly with the foam.
Drop a screw, point first, into the body of the marker and fill it with graffiti ink.
Push the nib piece back into the body of the marker with the eraser nib pointing up.
Wrap the body and nib piece in electrical tape to hold the pieces together and create a seal to keep the ink from leaking out. Replace the cap on the marker.