In the first position, the abrasive surface of the belt sander remains away from the work piece, and thus, does not contact {HEAD ~ the exterior surface} of {TAIL ~ the elongated work piece} 
of
In the first position , the abrasive surface of the belt sander remains away from the work piece , and thus , does not contact { HEAD ~ the exterior surface } of { TAIL ~ the elongated work piece }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL