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Before installing the pulley, make sure the shaft's inside threads are totally clean & free of burrs or grit that might cause the tool to bind. Chase them all the way to the bottom - if the install tool breaks and you have to drill it with a normal RH bit, it will spin to the bottom of the well.
If using a junkyard pump, this step is critical since this is a popular spot for mud-dauber wasps.
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