Passage means provide a path for lubricant to flow into {HEAD ~ the cavity} which has, within its boundaries, the internalexternal spline arrangement described, thus insuring {TAIL ~ continued lubrication} of the spline connection 
insuring
Passage means provide a path for lubricant to flow into { HEAD ~ the cavity } which has , within its boundaries , the internalexternal spline arrangement described , thus insuring { TAIL ~ continued lubrication } of the spline connection
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH