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Generally the mechanical pencil's lead refills would be thrown away when it left about 1.5 centimeter. However, the lead refills at 1.5cm still can be use for a long time, so it is a wasted move to throw away these lead refills.
This design is to make a central tube at the head of the mechanical pencil, to become a connection between the new lead refills and the old ones, so that the lead refills can be use up until 2mm and below.
National Yunlin University
of Science and Technology
Douliou, Yunlin ,, Taiwan