The oil filling funnel is mounted to {HEAD ~ a first end} of {TAIL ~ the extendable tube assembly} 
of
The oil filling funnel is mounted to { HEAD ~ a first end } of { TAIL ~ the extendable tube assembly }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL