A further subsidiary object is to provide {HEAD ~ a bushing} embedded in {TAIL ~ said cylindrical aperture} 
embedded in
A further subsidiary object is to provide { HEAD ~ a bushing } embedded in { TAIL ~ said cylindrical aperture }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL