The bolts are too long and impede the movement of the wheel. So I swapped the bolts and now the wheels move freely as intended. My pot bottom diameter is smaller than the carriage diameter, so my pot still fits even though the ends of the screws stick out in the carriage. Please keep this in mind when measuring the pots to fit the trolley exactly. Also, the screws are almost impossible to hand tighten because they are nylon coated on one end, making it difficult to screw past a certain point. My neighbor helped me and he used a car to fix the screws. He's a mechanic and said the design flaw was the length of the bolts. I just thought you should know.
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