Method for adjusting an installation for treating a series of containers, comprising: A phase of operation during which a first machine for treating containers, equipped with a plurality of first stations (28A, 28B, 28C, 28D), is driven in rotation and a second machine for treating containers, equipped with a plurality of second stations (36A, 36B, 36C, 36D, 36E, 36F, 36G, 36H), is driven in rotation, the installation having a point of transfer of each of the containers from the first to the second treatment machine the phase of operation comprising a step of synchronized operation in which the speeds of rotation of the first and second treatment machines are synchronized in such a manner that the frequency of passage of two first successive stations at the point of transfer is equal to the frequency of passage of two second successive stations at the same point of transfer, the phase of operation comprises a step of synchronized and paired operation in which the synchronized rotation of the first and second machines is accompanied by a repeated series of pairing duos at the point of transfer, each pairing duo comprising a first station arriving at the point of transfer at the same instant as a second station in such a manner as to permit the transfer of a container from the first station of the pairing duo towards the second station of the pairing duo, the adjustment method being characterized in that the driving in rotation of the first treatment machine is achieved by means of a first drive motor, the driving of the second treatment machine is achieved by means of a second drive motor distinct from the first motor, the adjustment method comprising a step of desynchronized pairing during which the first treatment machine and/or the second treatment machine is/are driven in rotation in a mutually desynchronized operation in such a manner as to bring a first station and a second station of one of the pairing duos to coincide, at the same moment, at the point of transfer. A phase of operation during which a first machine for treating containers, equipped with a plurality of first stations (28A, 28B, 28C, 28D), is driven in rotation and a second machine for treating containers, equipped with a plurality of second stations (36A, 36B, 36C, 36D, 36E, 36F, 36G, 36H), is driven in rotation, the installation having a point of transfer of each of the containers from the first to the second treatment machine the phase of operation comprising a step of synchronized operation in which the speeds of rotation of the first and second treatment machines are synchronized in such a manner that the frequency of passage of two first successive stations at the point of transfer is equal to the frequency of passage of two second successive stations at the same point of transfer, the phase of operation comprises a step of synchronized and paired operation in which the synchronized rotation of the first and second machines is accompanied by a repeated series of pairing duos at the point of transfer, each pairing duo comprising a first station arriving at the point of transfer at the same instant as a second station in such a manner as to permit the transfer of a container from the first station of the pairing duo towards the second station of the pairing duo, the adjustment method being characterized in that the driving in rotation of the first treatment machine is achieved by means of a first drive motor, the driving of the second treatment machine is achieved by means of a second drive motor distinct from the first motor, the adjustment method comprising a step of desynchronized pairing during which the first treatment machine and/or the second treatment machine is/are driven in rotation in a mutually desynchronized operation in such a manner as to bring a first station and a second station of one of the pairing duos to coincide, at the same moment, at the point of transfer.