A stub shaft 53 extends through the flanges 51 and 52 to form a hinged connection between {TAIL ~ the frame} 20 and {HEAD ~ the plate} 48,  
A stub shaft 53 extends through the flanges 51 and 52 to form a hinged connection between { TAIL ~ the frame } 20 and { HEAD ~ the plate } 48 ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH