Bench vise soft jaws

Most of 'em are a 'rectangle' with four fingers coming off at odd angles, and you just bend the fingers around to clamp 'em on.
You can use anything from pop cans to sheet lead to play-dough. Mcmaster has these for stupid money.
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Ebay has these
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Out of stock but easy to make/do. 4" Bench Vise Aluminum Soft Jaws 1 Set (2pcs) fits Yost, Wilton, Columbia, USA | eBay