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