Do you have an old ring that's large enough to use, minus the teeth?
I could plausibly dig something out but I have nothing to grind the teeth off with. Not sure if a 104 ring will go big enough to fully cover a 42t also?
Depends on how hard the alloy is, but I've easily removed teeth from rings with a dremel. Don't know about size wise.
@TvH started
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Do you have an old ring that's large enough to use, minus the teeth?