To remove, I do as POPI states but I have an old bench vise that I can rest the motor on top of with the wheel in between the jaws and punch the axle out. Then I can remove the axle with the second wheel, close down the jaws of the vice and set the second wheel on top of it with the axle in-between the jaws and punch it out. Note that the nail set will leave indentations on the ends of the axle. I then use the vice to squeeze the new wheels onto the axles, very slowly and one at a time, being careful to ensure they go on straight and frequently testing to ensure they end up in gauge.
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