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