The bottom edge 152 is sharpened prior to {HEAD ~ installation} of the knife in {TAIL ~ the cutter head} and is not thereafter sharpened by the sharpening mechanism 78 
The bottom edge 152 is sharpened prior to { HEAD ~ installation } of the knife in { TAIL ~ the cutter head } and is not thereafter sharpened by the sharpening mechanism 78
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH