said fourth plane of said edges of said open top side of {HEAD ~ said clasp lower part} being parallel to said first plane of said upper surface of {TAIL ~ said clasp upper part}  
said fourth plane of said edges of said open top side of { HEAD ~ said clasp lower part } being parallel to said first plane of said upper surface of { TAIL ~ said clasp upper part }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH