Rotor of haymaking machine provided with arms in two parts connected by a connecting device

A rotor of a haymaking machine, the rotor comprising a housing driven in rotation during work about a rotation axis directed upwards, and at least one oscillating arm arranged in a plane substantially perpendicular to the rotation axis, said oscillating arm comprising at least two parts, an internal part connected to the housing and an external part carrying work tools, one of the internal and external parts comprising an engaging portion able to engage along a longitudinal axis partially inside an orifice of an engaged portion of the other of the internal and external parts, the engaging portion and the engaged portion each comprising at least one hole oriented perpendicularly to the longitudinal axis and being able to be connected with one another by means of a connecting device, said connecting device comprising at least one threaded element having a geometric axis and provided with a shoulder, said threaded element passing through each hole of the engaging and engaged portions, wherein the connecting device comprises an insert with at least one tapping which can be arranged in an interior part of the engaging portion, and wherein the threaded element is screwed in the tapping, and wherein the shoulder rests on the engaged portion so as to tighten the engaged portion against the engaging portion along the geometric axis.