For this purpose {HEAD ~ an adjustable stop} 36 is mounted on {TAIL ~ the fixed carrier} 18  
is mounted on
For this purpose { HEAD ~ an adjustable stop } 36 is mounted on { TAIL ~ the fixed carrier } 18
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH