In this connection, if the clasp assumed a longitudinal position, i.e., a position in which {HEAD ~ the coupled direction} is perpendicular to {TAIL ~ the users body}, the tension on the clasp would act as a force effective to pull apart the metallic parts on the lever principle if the body surface has a sharp curve 
is perpendicular to
In this connection , if the clasp assumed a longitudinal position , i.e. , a position in which { HEAD ~ the coupled direction } is perpendicular to { TAIL ~ the users body } , the tension on the clasp would act as a force effective to pull apart the metallic parts on the lever principle if the body surface has a sharp curve
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH