I'd compare the length of the threaded portion of the ball joint to your original.
If it's longer.....I'd drill out the hole in a new lower location....the excess threaded portion hanging in space isn't doing anything
If the threaded portions are the same length then I'd check the diameter of the taper at the top and bottom to ensure it's like your original and not allowing it to pull through as far as it is
If that's the same then your steering knuckle has got to be really worn
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