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