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Theoretically yes it can; however, it would take a lot of work. the aluminum base of the front wall on the squash court would have to be removed and the court itself would have to be extended...
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From the USRA Rulebook: "The standard racquetball shall be 2 1/4 inches in diameter; weigh approximately 1.4 ounces; have a hardness of 55-60 inches durometer; and bounce 68-72 inches from a...