Preferably, {HEAD ~ the cylindrical aperture} comprises {TAIL ~ a cylindrical metal bushing} to receive a pivot pin 
comprises
Preferably , { HEAD ~ the cylindrical aperture } comprises { TAIL ~ a cylindrical metal bushing } to receive a pivot pin
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH