This slide, shows the top of the front vertical stand. It shows the clamping plate and nut and bolt that will clamp onto the rotating arm disc. The disc will fit into the 5mm gap shown on the slide. Once the nut and bolt are tightened, the rotating arm will be clamped firmly and the car will remain in position.
Two additional triangular plates are also shown welded to the structure. These are purely provided to give strength to the support.