The Sport Centre - Broadway Cycle Co. Inc. speed bag
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We're seeing more and more of these surfacing. It's essentially a swivel permanently attached to the bag. I surmise that it could work with a rope swivel, or a platform that had just a steel hook. I've seen photos of military encampments taken during WWII with rudimentary platforms that had bags with these on them, so they lasted a lot longer than originally thought. Not real fast by today's standards, but look at the size of the bags that the are attached to.
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