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