Thus, {TAIL ~ any required adjustment} may be obtained by positioning the appropriate slot on {HEAD ~ the key} of the shaft 
Thus , { TAIL ~ any required adjustment } may be obtained by positioning the appropriate slot on { HEAD ~ the key } of the shaft
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH