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