The external spline is capable of {TAIL ~ axial movement} with respect to {HEAD ~ the internal spline} 
The external spline is capable of { TAIL ~ axial movement } with respect to { HEAD ~ the internal spline }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD