Boom 16 is mounted on {HEAD ~ a yoke 32 subassembly} that includes {TAIL ~ a pair} of arms 34 with outwardly protruding pins 36 
includes
Boom 16 is mounted on { HEAD ~ a yoke 32 subassembly } that includes { TAIL ~ a pair } of arms 34 with outwardly protruding pins 36
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH