{HEAD ~ 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 a distance less than the distance between {TAIL ~ the position} defining indices by bringing a different one of the key slots into engagement with the shaft 
{ HEAD ~ 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 a distance less than the distance between { TAIL ~ the position } defining indices by bringing a different one of the key slots into engagement with the shaft
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH