The precession vibration and {HEAD ~ the torsional vibration} at {TAIL ~ a high speed rotation} can be suppressed because of the small backlash 
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The precession vibration and { HEAD ~ the torsional vibration } at { TAIL ~ a high speed rotation } can be suppressed because of the small backlash
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH