The direction adjustment assembly is mounted to {HEAD ~ the coupling assembly} that is attachable to {TAIL ~ an oil filling hole} of an engine 
is attachable to
The direction adjustment assembly is mounted to { HEAD ~ the coupling assembly } that is attachable to { TAIL ~ an oil filling hole } of an engine
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH