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David , The nuts under the allen head screws could be turning , preventing the screws from backing out . You may have to drill out the screws if all else fails . I have had good luck grinding the tips of the impeller without getting things noticably out of balance . You could use the cut doen impeller that Snyders sells . The cut down impeller is on page A-140 of the Snyders catalog , part # A-8501-iM Price $8.50