{HEAD ~ The guidewall} may be incorporated into {TAIL ~ an insert piece} or may be formed directly on the bottom trough surface 146 
incorporated into
{ HEAD ~ The guidewall } may be incorporated into { TAIL ~ an insert piece } or may be formed directly on the bottom trough surface 146
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH