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A friend tightened the lockring without the cassette on, and now we can't use the chain whip to unscrew it. It's on a road bike wheel if that matters. I'm looking for tools and ideas to undo this.

I found this post on a forum, but I'm looking for more answers https://www.lfgss.com/conversations/303374/

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    Can you remove the freehub from the hub with the lock ring in place? This opens a heap of options. Carefully grind or mill the lock ring down to remove the lip, so you can slid a cassette on. Fabricate a tool that will clamp around the freewheel and mesh with the splines. – mattnz Sep 1 '20 at 6:21
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Pad the freehub body with rags, hold it with a big pipe wrench or vice grips.

Another possibility is holding the freehub body pointing downwards in a vice with plastic soft-jaws (or padded with rags, again). If you position the freehub at the side of the jaws you can probably get the lockring tool in underneath.

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    I'd look at sliding pliers, aka plumbers pliers around the freehub body, and a lot of padding. The freehub is likely steel and will cope with this force. – Criggie Sep 1 '20 at 3:54
  • It's probably worth degreasing the freehub first. Clean and dry, a ruined inner tube is good for soft jaws or wrapping round the freehub. Cable ties can secure it if they don't get in the way of the pliers – Chris H Sep 1 '20 at 7:33
  • A thick piece of leather from a discarded belt is probably better than rubber, less shearing. – Carel Sep 1 '20 at 9:55
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Use a strap wrench on the freehub body.

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