> 							    ... i was told the
> noise was 'cavetation' ...like on a boat propeller. ??? 

 This is bullshit. Cavitation is caused by a pressure drop at the blade
which makes the water literally boil (albeit at low temperature). In a
pressurised, low circulation speed system this is unlikely in the extreme.

>						      ...i figured it was just
> the shaft wallowing around in the bushing.

 Far more plausible.

Cheers,
        W.
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