When {TAIL ~ the abrasive surface} contacts the exterior surface of {HEAD ~ the work piece}, it does so in a direction that is transverse to a longitudinal axis of the work piece 
When { TAIL ~ the abrasive surface } contacts the exterior surface of { HEAD ~ the work piece } , it does so in a direction that is transverse to a longitudinal axis of the work piece
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH