Just one embodiment of the invention includes a device, method and system for positioning a treatment instrument with respect to a patient. The novel device includes a holder for securing the treatment instrument (e.g., a magnetic stimulation device used for transcutaneous magnetic stimulation treatment of depression). The holder allows the treatment instrument to move about the patient. The device also includes a first arm that is coupled to the holder, and a vertical support that is coupled to the first arm. The first arm is substantially transverse to the vertical support, and may rotates about the vertical support in a horizontal axis. Such rotation, as well as movement and rotation of other components with respect to each other may be facilitated by a ball bearing construction.