Mechanism for a writing implement, a writing implement including such a mechanism, and a method of manufacture

A method of manufacturing a writing implement mechanism that includes a tubular element. The tubular element has a central axis and includes a first wall and a second wall which are fixed relative to each other. The second wall is offset towards the central axis relative to the first wall in a direction that is radial relative to the central axis. The first wall presents a first edge and the second wall presents a second edge. The first and second edges define a guide extending longitudinally between a first end and a second end in a direction that is inclined relative to the central axis. The method includes the steps of supplying at least two half-shells adapted to form the first edge and outside portions of the walls.