In the second position, the abrasive surface is in {TAIL ~ contact} with {HEAD ~ the exterior surface} of the elongated work piece 
In the second position , the abrasive surface is in { TAIL ~ contact } with { HEAD ~ the exterior surface } of the elongated work piece
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH