Replaced the water pump in my Kenmore washing machine was supposed to be an easy fix, but the washer is 27 years old. So the original pump, even though the fitting is plastic, was fused solid to the shaft of the motor. Chemicals, pry bars, etc wouldn't budge it. Without damaging the motor, the only option was to cut the old pump off piece by piece with a hacksaw and an oscillating tool. I did find why it was leaking which was the seal where the motor shaft is connected. Once the old one was off I had to clean and smooth the old motor shaft with a dremel tool, apply some lub and gently tap the new water pump into place. Works like a charm.