For example, a slot could be provided on {TAIL ~ the shaft}, and {HEAD ~ slot engaging members} could be provided on the disc 
For example , a slot could be provided on { TAIL ~ the shaft } , and { HEAD ~ slot engaging members } could be provided on the disc
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH