since the inertia element 5 is supported on the actuation element 3 via the bearing 6 the co axial alignment between the two elements is ensured also note that the housing 54 of the actuation element is made from aluminium whereas the core 55 of the actuation element is made from steel in this way the field is prevented from flowing around the inertia element 5 and is instead forced through the axial gaps 11 if the housing 54 were made from steel there would be a risk that the magnetic field lines would run in the housing 54 instead of through the axial gaps 11 seals 53 are present between the inertia element 5 and the actuation element 3 which prevent the mr fluid from reaching the bearing 6 it should be noted that in the above embodiments the u201c axial gap u201d has been essentially parallel to the axis of the actuation element however the u201c axial u201d gap could assume other angles to the axis of the actuation element for example it could be imagined that the angle was between 0 u00b0 and 45 u00b0 it is also to be noted that the figures and the above description have shown the example embodiments in a simple and schematic manner the internal electronic and mechanical details have not been shown in great detail since a person skilled in the art of electrical and or mechanical engineering should be familiar with these details and they would.