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