Just pull the tube out and fill it with ink. Take a thick piece of paper, roll the tip of the pen, twist it back and forth, pull it out, fill it with ink, and insert the tip carefully! Pull out that head, and the one in the clear tube will come out together, and the house red ink will do. Pay attention to the ink when pulling out, such as taking out the internal cavernous body immersed in the ink method, using the injection needle and other methods can cleverly use atmospheric pressure to suck into the ink, directly insert the ink after pressing the upper end of the tube, plus the hose exhaust.