said upper surface of said clasp upper part being inclined relative to {HEAD ~ said lower surface} of {TAIL ~ said clasp lower part} when pressed together so that said upper and lower surfaces are non parallel to each other 
of
said upper surface of said clasp upper part being inclined relative to { HEAD ~ said lower surface } of { TAIL ~ said clasp lower part } when pressed together so that said upper and lower surfaces are non parallel to each other
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH