Sales occurring in the pencil with eraser on the end is very convenient: it is always possible to erase an inaccurate line or bar.
However, to make such a pencil, if you use the appropriate cap from a ballpoint pen.
Cut off the top cap and insert the carved from a school eraser cylinder.
Recommend to read
WITH THE BALL IN THORNS
Old children's ball cut in half and put on garden shears, protects hands when cutting thorny plants.
TAP THE RECEIVER
(Uninterrupted power supply). On the upper floors in apartment buildings, often the water flows from the taps, that is, barely (or not at all) due to inadequate pressure in water supply...