A clip includes a grommet and a pin. More particularly, it concerns a method for hydrocyanation of organic compounds comprising at least a ethylenical bond by reacting hydrogen cyanide, in the presence of a catalytic system comprising a transition metal and an organophosphorus ligand. A first register is used to communicate information from a first processing entity to a second processing entity, while a second register is used to communication information from the second processing entity to the first processing entity. In addition, a brake is provided for providing shock absorption and as a fulcrum to make more powerful acceleration.