Comprises a first phase in which is arranged on a support a pellet (1) comprising a body (2) and a head (3) with an internal cavity (4) of sufficient size to accommodate at least a portion of a tip (5) therein, characterized by comprising a second in Ia a tip (5), formed by an upper part (5a), completed in at least one vertex, and a lower part (5b) faces, joined at their bases, and facing said lower part (5b) to the mentioned internal cavity (4) of the head (3), a third phase in which is dropped said tip (5) inside the internal cavity (4), impacting the lower part (5b) of the tip (5) inside the internal cavity (4) and positioned within said internal cavity (4), and a fourth phase in which strangles the head (3 ) strangulating and setting, in turn, said head (3) to the tip (5).
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