Guys a quick question for you, I've changed my discs and pads on the front yesterday and one of those screws in the disc had rounded off so I tried drilling it out and am now left with half a screw in the hub. Do I really need the screws in the disc in first place or can i safely drive without them in? Surely the wheel does a good enough job at holding the disc on, that how it works on every mondeo I've ever worked on.