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When the burner is running on the boiler the view port door makes a lot of racket. It makes a metallic vibrating noise that can be heard throughout the whole house. The viewport door is attached by a single screw in the lower right corner. If I put a little pressue on the door with say my foot while it is running the noise stops (and my shoe starts to smoke, but thats just my own stupidity). I have tried to tighten the screw but it does not seem to make any difference. Any ideas on how I might be able to stop the noise?