Can anyone tell me what’s up with this Everlast swivel? What is the black part of the base? Is it rubber or plastic, and did this design come before or after the all metal version of the swivel and why?
https://www.ebay.com/itm/Everlast-44...2e62%7Ciid%3A1
https://www.ebay.com/itm/Everlast-44...2e62%7Ciid%3A1
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