2filter should be able to resolve it, they are great to work with.
As to the design, I agree it's a bad one. I have asked Lee 2x to allow a similar design as the SW-150 uses, i.e. screw down instead of spring clip. You can easily push the entire rig off from the wide angle ring.
As a safety, I carry large rubber bands, that will fit around the entire mount and keep the latch all the way down, with pressure. Not pretty, but much safer. Once you drop a wide angle hood, with 105mm CL-PL on the front and a ND 1.2 into a river, you figure it's time to fix this.
Hope they get you taken care of.
Paul