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