{TAIL ~ a clasp upper part} having {HEAD ~ a dish shaped cross section} to provide an upper surface and an open underside with downwardly facing edges 
{ TAIL ~ a clasp upper part } having { HEAD ~ a dish shaped cross section } to provide an upper surface and an open underside with downwardly facing edges
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH