Extension for pencils with worn leads

An extension for a pencil with a wearing lead, the extension comprising:

• a thin-walled hollow profile forming a body of the extension, said body having an inner surface and an outer surface, and said body having a first end and a second end between a longitudinal direction of said body;
• said body having an inner cross-section configured to accommodate the pencil, and said first end being configured to accommodate an insertion of the pencil into said body, and said second end being configured to project a writing end of the pencil;
• a tapered end section of said second end having at least one slot extending in said longitudinal direction;
• said tapered end section having a slight linear reduction in said inner cross-section over the length of said at least one slot in said longitudinal direction;
• at least one elevation arranged along at least a portion of said inner surface of said body in said longitudinal direction, said at least one elevation being configured to engage the pencil when the pencil inserted into said body;
• said at least one elevation having a cross-sectional form selected from the group consisting of triangular, square, and semi-circular, and said at least one elevation being a plurality of elevations, said elevations being arranged asymmetrically on opposite sides of said inner surface of said body, and said elevations having different cross-sectional forms;
• and
• a plurality of retaining springs arranged on said inner surface of said body, said retaining springs being configured to accommodate an insertion of the pencil into said body and to prevent the pencil from movement in a direction opposite of a direction of insertion.