How to repair mechanical pencil, a Japanese zebra, if it is broken?

Mechanical pencil, Japanese zebra, broken. The treatment method is as follows:

Turn the pen head down and hit the head with something, then play the pen tube and blow it from behind.

Automatic refill is a very fragile wooden body. If you don't pay attention, breaking the refill is the basic routine. Secondly, because of the length of the refill, the original normal refill was played by you for 30 minutes, and the result of the broken refill is obvious to all. The problem of broken mechanical pencil refills will never happen again. A mechanical pencil was found to have been used for a whole semester.

In fact, mechanical pencil's refill is made of graphite and clay in a certain proportion. The strength of these two materials after solidification is very low, and brittle fracture is easy to occur, and the fracture situation is closely related to the stress of lead core. When you are using mechanical pencil, you need to hold mechanical pencil with your hand and exert some pressure before the handwriting will appear on the paper.

Tooth tip core replacement:

1, changing the nib is suitable for rotary mechanical pencil. When replacing, rotate the pen holder clockwise until it can't move, and then the lead will automatically fall off. This method must be held at the pen cap and rotated at the pen holder.

2. Turn a little counterclockwise, put the lead in, continue to turn the pen counterclockwise, and slowly screw the lead in until it is slightly exposed and very concentrated, about 2-3 mm.

3. When the pen tip is facing down, the refill will automatically drop, or it will not drop, but it will drop when the hand touches it. Don't worry, this situation is normal, because the lead has not yet entered the card slot. Just find a smooth and slightly hard material such as a notebook or desktop and press the lead down slightly.

Reference to the above content: Baidu Encyclopedia-mechanical pencil