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