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