Then unscrew the nut on the side of the pin, take out the parts of the pin, and then take out the pin. Finally, dig out the broken refill with a pin, and you can do it.
Generally, there is a round gear next to the compass foot. Loosen it, then insert something sharp and thin, press it and the refill will come out.
Compass is a tool for drawing circles or strings in mathematics and drawing, and is often used for drawing with a ruler. Compass is made of metal composite material and plastic, including two parts connected by hinge, which can be adjusted.