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