I don't know that this would work well for the IP, but it's $6 shipped for a 9/16 and 5/8 curved wrench:
https://www.ebay.com/itm/Craftsman-9-16-x-5-8-Fully-Polished-12pt-Obstruction-Wrench-New-Tools-47463/291660888677
I bought one "just in case" I ever need it for that or something else. It's box ends are as wide as normal wenches, so grinding them thinner might still be required?
https://www.ebay.com/itm/Craftsman-9-16-x-5-8-Fully-Polished-12pt-Obstruction-Wrench-New-Tools-47463/291660888677
I bought one "just in case" I ever need it for that or something else. It's box ends are as wide as normal wenches, so grinding them thinner might still be required?
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