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