a tether passing through {HEAD ~ the stitched loops} to facilitate {TAIL ~ application} of tension to the apparatus 
to facilitate
a tether passing through { HEAD ~ the stitched loops } to facilitate { TAIL ~ application } of tension to the apparatus
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH