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