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Old 11-20-2012, 11:55 AM   #5
Steve Huff
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Join Date: Feb 2004
Posts: 7,183
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What are called "dogs" are worn out. You can replace them yourself if you have any mechanical aptitude (I did when I had mine, and I'm lousy at that kind of stuff). You can get them at Tennismachinesinc.com. They're pretty cheap, and he can explain how to replace them.
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