put a large ish flat screwdriver behind the plug hinge and the stiffening bar apply some tension by binging the screwdiver towards vertical and give the shaft of the screwdriver a sideways blow and the hinge will fly out with no damage to either part
Thanks guys I got the one off the sys mft easy, the other systainer had the divider bar. That was throwing me off. The video kinda cleared it up for me.