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