You put lead in one end, then you push down on the top of the object, and it pushes a split plastic peice so that the split spreads and lets lead out, and when you release pressure on the top, the split closes to hold the lead in place.
The mechanical parts that are visible are the top which you push down on to release more lead.
You can't see how the lead is released and you cant see the mechanisms used to push lead out. Most of the mechanics are on the inside.
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