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