the halves are bonded -likely w/ a plastic-weld adhesive.
they are not intended to be split.
of course, as yours is a complete loss -try razoring around the perimeter until they split.
if you can replace the cord, then try "tenax" or similar to rebond.
oh, and take a pic of the inside! i am sure we would all like to see the guts while one is open.
also, 140x's are often on ebay for good prices.