a substrate on which {HEAD ~ several tangentially oscillating masses} are arranged about {TAIL ~ the z axis} that is perpendicularly positioned on the substrate, the oscillating masses are fastened to the substrate with springs and tie bolts 
are arranged about
a substrate on which { HEAD ~ several tangentially oscillating masses } are arranged about { TAIL ~ the z axis } that is perpendicularly positioned on the substrate , the oscillating masses are fastened to the substrate with springs and tie bolts
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH