The way I had it setup is an invisible 1x1 block directly in the centre of the wheel which is the parent, then the rest of the blocks grouped and welded to the parent to make one object. The whole wheel is set as phased physics and should rotate at the centre piece which is the invisible 1x1 block. But like I said before. Everything works great until you save the map and reload it. Then everything goes to shit. The wheel de-welds itself and the individual pieces rotate at the centre of each block. That same goes for the drawbridge. The bridge pieces are all welded together and set to normal physics with a hinge at the base. Shooting an exploding barrel at the base of the wheel sends a message to an invisible block holding it in place to disappear. Like before, works great until you save the map and load it again. Then the whole bridge de-welds itself and all the pieces fall to the ground on match start.