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