I went to Harbor Freight (twice), Home Depot, Lowes, AutoZone, B&M Auto Parts and Ace Hardware to buy the new wheels, spacers, flat washers and retainer washers (aka "Push Nut Caps for Unthreaded Axles")
Harbor Freight had the wheels and Ace Hardware had the spacers, flat washers and the retainer washers (Push Nut Caps for unthreaded axles). Home Depot, Lowes and Auto Zone did not have any/most/all of these items.
"Push-nut" or "retaining washer". I'm sure there must be some
patent-holder's name associated with them similar as to Philips or
Roberson screws, but I'm not aware of it...
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