The apparatus includes a body structure having {TAIL ~ a rotational axis}, a discrete hollow structure and {HEAD ~ at least one dampening member} 
The apparatus includes a body structure having { TAIL ~ a rotational axis } , a discrete hollow structure and { HEAD ~ at least one dampening member }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD