Furthermore, {TAIL ~ the base} may be a metal base and have {HEAD ~ an integrally formed hollow portion} 
Furthermore , { TAIL ~ the base } may be a metal base and have { HEAD ~ an integrally formed hollow portion }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD