As explained below, such an arrangement facilitates performing alignment and height setting operations at {HEAD ~ widely spaced blade height positions} to increase {TAIL ~ the accuracy} of those procedures 
to increase
As explained below , such an arrangement facilitates performing alignment and height setting operations at { HEAD ~ widely spaced blade height positions } to increase { TAIL ~ the accuracy } of those procedures
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH