At the grocery store the other day, my cart suddenly broke into what I can only describe as the grocery store version of a motorcycle death wobble—wheels shaking, screeching, veering like a lemming in sight of a cliff. It caused, and this might be a slight exaggeration, a huge scene. At one point, I abandoned the cart entirely and carried all 57 items to checkout in my arms like a deranged contestant on “Supermarket Sweep.” As I walked away (dignity in shreds), I kicked one of the offending wheels (do not recommend, I was wearing sandals) and spotted a small U-shaped bar around it. If that little bar was supposed to help the cart steer straight, it was doing a terrible job. “That’s called chattering when the wheels do that, and it really can be alarming,” says Brett Nelson, CEO of The Peggs Company, a U.S. company that does all things shopping carts. (Who knew that actually had a name?!) “And no, that bar on the back wheel had nothing to do with your steering issues. It has a differ...
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