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Mumbles: Yes, that is the modification. Mine predates that modification and has what frankr sent the drawing of. I have a plan. I had the metal washer above the plastic disk and o-ring.
frankr’s diagram shows it the other way around. I’m thinking and hoping that the reason it would not go the last 1/4 of an inch is my incorrect placement of the metal washer. So, tomorrow I will flip them around and try again. I can well understand why OMC came out with the modification kit. Changing the impeller is a very common maintenance task. They likely heard a lot about this.
Reivertom: Good luck with yours. They are a great motor.
Will keep everyone posted. Thanks to all.