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The problem with cotter pins is that the nut only have N number of notches. If the nut ends in a position when the hole in the axle does not align with one of the notches when tightened to the proper torque some people aim for the next notch and end up up over torquing it. The thread is pretty coarse so its very easy to do. I usually back off to the previous notch. The pin will hold the nut in place, it will not get lose.
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