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