securing a backing sheet of {HEAD ~ supple fabric material} with {TAIL ~ one broadside} thereof affixed to the other broadside of the sheet of flexible, resilient material 
with
securing a backing sheet of { HEAD ~ supple fabric material } with { TAIL ~ one broadside } thereof affixed to the other broadside of the sheet of flexible , resilient material
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH