What does your collar look like on the hub that is usually were the leak is caused? I am block of wood and hammer guy, but I am sure there is a proper tool. They make that go over seal sleeve also if your hub is grooved out too much, but I have never had any luck with that stuff; they make the hub to big. Clean up the hub with some fine paper and the seal will probably land in a different spot anyway and you will be fine or buy a new hub.