Saw an old photo of Mohammad Ali hitting a speed bag. Hard to see clearly in the photo but it looks like the swivel is one square plate mounted on another at 45 degrees. Ever seen one like this before?
Ebay link is http://www.ebay.com/itm/Muhammad-Ali...item51bb459033
Ebay link is http://www.ebay.com/itm/Muhammad-Ali...item51bb459033
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