The angular spacing between the key slots is unequal and is substantially greater than the spacing between the position defining indices; but the position of the position defining indices relative to the shaft may be adjusted by {HEAD ~ a distance} less than {TAIL ~ the distance} between the position defining indices by bringing a different one of the key slots into engagement with the shaft 
less than
The angular spacing between the key slots is unequal and is substantially greater than the spacing between the position defining indices ; but the position of the position defining indices relative to the shaft may be adjusted by { HEAD ~ a distance } less than { TAIL ~ the distance } between the position defining indices by bringing a different one of the key slots into engagement with the shaft
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH