At least one other mass is configured to deflect radially to the z axis in {TAIL ~ a x y plane} parallel to the plane of {HEAD ~ the substrate} 
At least one other mass is configured to deflect radially to the z axis in { TAIL ~ a x y plane } parallel to the plane of { HEAD ~ the substrate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD