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