When {TAIL ~ these recesses} are indexed to face {HEAD ~ the opposed cutter bar}, such cutter elements are rendered inoperative 
When { TAIL ~ these recesses } are indexed to face { HEAD ~ the opposed cutter bar } , such cutter elements are rendered inoperative
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH