The circular, and relative rotation between {HEAD ~ the circular member} and the shaft is prevented by a plurality of key slots or the like disposed on said circular member and engaging a key, and slot or {TAIL ~ the like} on the shaft 
The circular , and relative rotation between { HEAD ~ the circular member } and the shaft is prevented by a plurality of key slots or the like disposed on said circular member and engaging a key , and slot or { TAIL ~ the like } on the shaft
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH