Alternatively, the shaft could be provided with {TAIL ~ a plurality} of keys or keyslots, and {HEAD ~ the disc} 51 provided with a single keyslot or slot engaging member 
Alternatively , the shaft could be provided with { TAIL ~ a plurality } of keys or keyslots , and { HEAD ~ the disc } 51 provided with a single keyslot or slot engaging member
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH