Need to remove the rear bumper brackets on my 4x4 Cosworth. The inside ones that bolt through the floor of the boot not the outside ones. Basically need to remove them from the height adjusters. One end has the height adjusting screw but the other end looks like it may have been riveted over on top of a washer. I thought at first it was a circlip but no. I cant grind off the top of the riveted bit as I need to re-use it. Any one taken these off before. Not sure how easy it is to see in the pictures. Thanks David