An assembly for a turbomachine comprising: - a casing, - a first rotor: ∘ movable in rotation relative to the casing around a longitudinal axis (X-X), and ∘ comprising: * a disk, and * a plurality of blades capable of flapping relative to the disk during a rotation of the first rotor relative to the casing, - a second rotor movable in rotation relative to the casing around the longitudinal axis (X-X), the second rotor integral in rotation with the first rotor, and - a damper configured to damp a movement of the first rotor relative to the second rotor, in a plane orthogonal to the longitudinal axis (X-X), the movement being caused by a flapping of at least one blade among the plurality of blades, the damper comprising: ∘ a first bearing part: * bearing against the first rotor, * being configured to apply a first centrifugal force on the first rotor, and * having a radially outer surface coming into contact with a radially inner surface of the first rotor, ∘ a second bearing part: * bearing against the second rotor, * being configured to apply a second centrifugal force on the second rotor, and * having a radially outer surface coming into contact with a radially inner surface of the second rotor, and ∘ a linking part: * connecting the first bearing part to the second bearing part, and * being thinned relative to the first bearing part and the second bearing part, the assembly being characterized it comprises a flyweight fixedly mounted on the damper. - a casing, - a first rotor: ∘ movable in rotation relative to the casing around a longitudinal axis (X-X), and ∘ comprising: * a disk, and * a plurality of blades capable of flapping relative to the disk during a rotation of the first rotor relative to the casing, ∘ movable in rotation relative to the casing around a longitudinal axis (X-X), and ∘ comprising: * a disk, and * a plurality of blades capable of flapping relative to the disk during a rotation of the first rotor relative to the casing, * a disk, and * a plurality of blades capable of flapping relative to the disk during a rotation of the first rotor relative to the casing, - a second rotor movable in rotation relative to the casing around the longitudinal axis (X-X), the second rotor integral in rotation with the first rotor, and - a damper configured to damp a movement of the first rotor relative to the second rotor, in a plane orthogonal to the longitudinal axis (X-X), the movement being caused by a flapping of at least one blade among the plurality of blades, the damper comprising: ∘ a first bearing part: * bearing against the first rotor, * being configured to apply a first centrifugal force on the first rotor, and * having a radially outer surface coming into contact with a radially inner surface of the first rotor, ∘ a second bearing part: * bearing against the second rotor, * being configured to apply a second centrifugal force on the second rotor, and * having a radially outer surface coming into contact with a radially inner surface of the second rotor, and ∘ a linking part: * connecting the first bearing part to the second bearing part, and * being thinned relative to the first bearing part and the second bearing part, ∘ a first bearing part: * bearing against the first rotor, * being configured to apply a first centrifugal force on the first rotor, and * having a radially outer surface coming into contact with a radially inner surface of the first rotor, * bearing against the first rotor, * being configured to apply a first centrifugal force on the first rotor, and * having a radially outer surface coming into contact with a radially inner surface of the first rotor, ∘ a second bearing part: * bearing against the second rotor, * being configured to apply a second centrifugal force on the second rotor, and * having a radially outer surface coming into contact with a radially inner surface of the second rotor, and * bearing against the second rotor, * being configured to apply a second centrifugal force on the second rotor, and * having a radially outer surface coming into contact with a radially inner surface of the second rotor, and ∘ a linking part: * connecting the first bearing part to the second bearing part, and * being thinned relative to the first bearing part and the second bearing part, * connecting the first bearing part to the second bearing part, and * being thinned relative to the first bearing part and the second bearing part,