HI THERE I HAVE JUST FITTED A NEW HEATER MATRIX BUT WHILST FITTING IT UP TO THE TWO PIPES THAT COME THROUGH THE BULK HEAD I BROKE THE PLASTIC CASING ON THE MATRIX INCLUDING THE HOLE FOR THE 7MM BOLT I HAVE GLUED THIS BACK TOGETHER AND FITTED IT TO THE CAR HOWEVER I HAVE YET TO FILL THE COOLING SYSTEM DOES ANYONE THINK THAT THIS WILL LEAK?