The aperture and associated shaft end which form {HEAD ~ the universal joint} have {TAIL ~ corresponding non circular cross sections} for enabling a slip fit connection 
The aperture and associated shaft end which form { HEAD ~ the universal joint } have { TAIL ~ corresponding non circular cross sections } for enabling a slip fit connection
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH