[Dan in Pasadena]

As it was taught to me (& I was SUPPOSED to teach H.S. Auto Shop...remember that once existed?) tighten the nut til you can just move the flat washer on top of it using a RADIAL motion turn of a flat screwdrive. NOT by prying. That washer has grease on it so it'll move by prying no matter how much you tighten. Then, once it's that tight go to the nearest opening on the castelated nut to put the cotter pin in.
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