The upper end of the link 13a is hinged to {HEAD ~ a bolt} 14, which can be adjusted relative to the upper plate 8 and can be fixed in every adjusted position by {TAIL ~ a nut} 15 
fixed by
The upper end of the link 13a is hinged to { HEAD ~ a bolt } 14 , which can be adjusted relative to the upper plate 8 and can be fixed in every adjusted position by { TAIL ~ a nut } 15
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH