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