Try a Tennis shop!. I imagine if they can fix the strings on a tennis racket, they can fix the strings on a racketball racket. I also would think that a health club with racketball courts they could do it. I mean they have so many rackets that they need to be able to fix them.
i string racquets. i have a stand up stringing machine that i bought off of craigs list. anyways, it is recommended that you restring every 6 months to a year. your racket should make a pinging sound every time you hit the ball. if it sounds like a thud, it's time to restring the racket. it's best to go to a tennis pro shop. the big retailers have a very long turnaround. tennis proshops usually take half a day and also dpending on how busy they are. i can do mine in 90 minutes per stick.
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