Abstract: The present invention relates to a balancing, positioning and fixating assembly for balancing a treatment device, comprising balance arm having a first arm end and a second arm end, a stepper part having a first part end and a second part end, the first arm end is connected with the second part end via a first pivot joint so that the balance arm is movable in relation to the stepper part, and an angulator device is arranged in connection with the second arm end, the angulator device is configured to connect the treatment device to the balance arm and to facilitate movement of the treatment device in different angles, wherein a spring device having a predetermined spring force is arranged along the balance arm, the spring device has a first spring end and a second spring end.