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For decades my SOP has been after winter haul out to carefully pull out the impeller & shaft, coat the shaft with light grease or oil, wrap in plastic and store. This provides a opportunity for impeller and gasket inspection. [Note, angle burr the shaft edges to facilitate safe re install]' Also can check if grease cup is working properly squeezing grease inward and not just oozing out of cup. You should always keep a couple of $3 Moyer gaskets and an extra impellor on board. Admittedly you have to be a little bit of a contortionist and handle a long needle nose pliers surgically, but I can't remember when the last time I had broken impellor vane.
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