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I was a little off, it was a cresent wrench they used. not vice grips just drill through the jaws and put the pins in so they protrude out the side of the jaws. then the thumbscrew sets the distance between the pins, maybe braise the pin in and Id use hard steel for the pins, you might use drill rod and temper it if you are so inclined. you cna buy stuff Im sure but it dint look like a difficult project to just make up in your own shop.
drill rod is easily purchased in about 3 foot lengths,in n=most sizes etric and standard. the metalurgy is such that it can be hardened but sold in the state whher it is still machinable. basically heat and quench, how hot might affect its hardness You dont want brittle.. I think you can heat it red, let cool heat to straw color quench in oil.
the one I saw he had machined down the pin on one side so it had smaller diameter pins on one side than the other.
if you didnt want oharden you might just press them in or maybe tack weld on one side to prenebt overheating and affecting the temper, then for that, start with a hardened pin. no tempering.
there is a bit of a sciuence to correct annealing and tempering but basically you heat and quench makes the steel hardened, too hard means brittle.
maybe just sacrifice an old cresent made by "husky" or similar, not your favorite "snap-on quality" one.
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