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Had the same issue with a non OEM pump and went down the route of filing the tips of the impellers. I marked the ends of the impellers with a felt tip pen and test fitted and rotated by hand and then simply removed the high spots. Sounds a bit of a rough solution to some but it's pretty basic mechanical fitting skills. That was a couple of years and ten thousand miles ago so it's either fine or of if the doom merchants are correct I am heading towards a catastrophe.
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