I prefer to employ a shorter LES because placing a limitation on its travel allows variations in {HEAD ~ its length} to control {TAIL ~ the angular relationship} between the pleating elements and the main blade 
to control
I prefer to employ a shorter LES because placing a limitation on its travel allows variations in { HEAD ~ its length } to control { TAIL ~ the angular relationship } between the pleating elements and the main blade
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH