A process for producing polymers having at least one high vinyl end segment is provided. When the radio navigation equipment operates, the radar emits periodically in all or part of the frequency band and then halts its emissions, each emission has a given duration and being separated from the previous emission by an interval of silence. The foreign matter formed over the surface of the lead can be reliably removed by washing the surface of the lead after the removal of the residual resin. The backstop lip on the rear of the pulleys prevents the belt from overshooting the V-groove.