omc cobra water pump replacement

[thecoch]

replacing water pump impeller only becasue it is 10 years old - no known problems. Found a youtube video that seems really good except that when they forch the housung over the impeller they say to rotate the housing clockwise. The housing/impeller I removed clearly has the opposite rotation of the impeller blades that would require a counter clockwise rotation of the housing on the impeller at insertion. Since the engine will 'win' on which way the blades end up, or will rip the impeller to shreds, any help on which way the impeller should be forces at housing insertion would be greatly appreciate. TIA