Guys had someone round today to fix my cracked manifold. They have managed to warp the flange badly. How can we get this back straight. Guy has offered to sort out at his cost so anyone on here up for it? It now has major lips between the relief cuts (these are now touching in places and it no longer fits on the car, seems like it is a good 7mm or so out! Did warn him that it needed bolting to something to stop it warping. Help please as desperate :-(