You will need some blue gasket sealant. On the front side of the gasket there is a place where you switch from the gasket to what looks like a half o-ring. You have to place a bit of sealant on both sides where the materials meet. I advise getting a magnet retriever (not sure of correct name). It looks like a telescoping pen with a magnet on the end. The bolts on the back side of the cover are a bit difficult to reinstall and easy to drop and lose. I put the bolt on the magnet then use the retriever to place the bolt in position, then turn it a couple turns to get the bolt started. I have fairly large hands, you may not have the same problem. If you lose a bolt, remember that they're metric.