A predetermined length of the fabric material is then positioned over {HEAD ~ the frame} to overlie {TAIL ~ the retention groove} in the side members 
to overlie
A predetermined length of the fabric material is then positioned over { HEAD ~ the frame } to overlie { TAIL ~ the retention groove } in the side members
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