When I first built the car, I thought the hexes were plastic pieces, so I just put the pins on the axle and snapped the hexes on. The hexes are actually metal, so they were obviously not meant to bend back and forth like that. Then I realised you were supposed to mount the hexes first and then carefully align the hex holes with the axle holes and push the pin through. Since I started putting them on the proper way, I've not had trouble with them.
Not to accuse anybody else of being as dumb as I was, but just thought I'd mention my experience with them.
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