when u fit it they give you two special nuts, they are hollow, i got to one quite easily and tightened it as much as the socket would allow, the second was a bugger to do so i left it and forget the third not unless you got a specialist tool or your taking the engine out, but with the one its not flappin or loose or anything. My old heatshield was fecked, it looked like it had been screwed up and then straightened again! It was also made of an asbestos type material, this new one .is a very solid non crushable type