A magnetic coupling member, method, and system including a housing and a first arrangement of a plurality of magnets housed within the housing is disclosed. The device is secured with a fixed spindle or a fixed toothed rack to the first of two parts which can be adjusted in relation to each other, and is provided with a gear mechanism which is connected to the second of the two parts which can be adjusted in relation to each other. A computer readable code is provided for allowing a dragging movement of the first center frequency, the second center frequency, and the third center frequency.