I’d go to the junkyards and find a whole cassette and replace. Forgot rebuilding. Installing is not the hard and you can do it yourself. You do look like a dying cockroach while you’re putting it in, but it gets the job done.
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Like you, I drive an X5. Also like you, I'm a detective trying to figure out what's wrong now, how long will it take make to fix it and how much will it cost this time