The first sleeve is bonded to {TAIL ~ both a portion} of the exterior surface of the core and a portion of the interior surface of {HEAD ~ the second sleeve} 
The first sleeve is bonded to { TAIL ~ both a portion } of the exterior surface of the core and a portion of the interior surface of { HEAD ~ the second sleeve }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD