1. Screw the steel ink bag out of the pen holder and squeeze the ink bag with your fingers.

2. Put the pen tip into the ink and completely submerge the pen tip to avoid inhaling air.

3. After sucking the ink, put down the pen tip and release six to eight drops of ink.

4. Tighten the piston rod so that the pen tip faces upwards, so that the remaining ink on the pen tongue can flow back to the ink storage tank.

5. Wipe the tip of the pen and around the tongue with cotton paper to complete the ink input program.