Today the theme of metal pencils, invented before graphite, is popular. They are also called "eternal" because they wear out more slowly. Metal pencils are made do it yourselfas well as buy ready-made. I myself translated an article on the independent manufacture of such a pencil.
Do you want to get a metal pencil - unpretentious, but valid - in a few seconds from the usual? Not anyone, but one with an eraser on the opposite side in a metal holder. Remove the eraser, flatten the holder as shown on the KDPV. And it works. It really wears out very slowly, in hardness it looks like an aluminum alloy. The track is pale, but not as much as it turned out in the photo, and very thin. For fans to work out the small details of the image - that’s it.
Unlike other metal pencils, this eraser is still erased. But not completely, moreover, an impressed trace remains.
This homemade - rather, a visual aid showing the principle of operation of a metal pencil than a thing suitable for everyday use. But this visual aid is valid.