I just ordered a used one on eBay to use at work. I think it is the fact that it's a ball hook swivel. When I went from an Everlast ubolt to a ball hook I found it much slower with less rebounds per hit than the ubolt. Also are you using the stock black bladder? And EZspeedbag has some replacement balls made of metal that are supposed to be faster than the stock ball.
I'll leave some feedback after mine arrives.
I'll leave some feedback after mine arrives.
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