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