The invention provides mechanisms useful for adjusting the positioning of an attached device, such as a display or input device. In one embodiment, the mechanism is a front end height adjustment mechanism comprising a track apparatus, a display mounting bracket, a sliding bracket, and a motion regulating device. In another embodiment, the mechanism comprises a device support arm, such as a monitor arm. The invention further provides a method for adjusting the positioning of a display or input device, such as a flat screen monitor, wherein the method comprises providing a mechanism of the invention, attaching the mechanism to a support, attaching a display or input device to the mechanism, and positionally adjusting the display or input device.