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