The present invention relates to a rotor (11, 12) having a rotating housing (18) and at least one oscillating arm (19), which oscillating arm (19) has at least one inner part (20) connected to the housing (18) and an outer portion (21) carrying tools (13), one of the portions (20, 21) having an engaging portion (24) partially engageable in an engaged portion (25) of the other portion (20, 21), said portions (24, 25) each having at least one hole (28, 29, 30, 31) and being connectable by means of a connecting device (32) having at least one threaded element (33, 34 ) with a shoulder (36, 37), which threaded element (33, 34) passes through each hole (28, 29, 30, 31) of said portions (24, 25). According to the invention, the connecting device (32) comprises an insert (38) with at least one tapping (39, 40) insertable inside the engaging portion (24), the threaded element (33, 34). is screwed into the tapping (39, 40) and the shoulder (36, 37) is supported on the engaged portion (25) to clamp the engaged portion (25) against the engaging portion (24).La présente invention concerne un rotor (11, 12) comportant un boîtier (18) rotatif et au moins un bras oscillant (19), lequel bras oscillant (19) comportant au moins une partie interne (20) liée au boîtier (18) et une partie externe (21) portant des outils (13), l'une des parties (20, 21) comportant une portion engageante (24) pouvant s'engager partiellement dans une portion engagée (25) de l'autre partie (20, 21), lesdites portions (24, 25) comportant chacune au moins un trou (28, 29, 30, 31) et pouvant être assemblées au moyen d'un dispositif de liaison (32) comportant au moins un élément fileté (33, 34) avec un épaulement (36, 37), lequel élément fileté (33, 34) traversant chaque trou (28, 29, 30, 31) desdites portions (24, 25). Selon l'invention, le dispositif de liaison (32) comporte un insert (38) avec au moins un taraudage (39, 40) insérable à l'intérieur de la portion engageante (24), l'élément fileté (33, 34) est
