i have never done a spiral bushing but as far as i know the technique uses a thin spiral of woodshaving in the hole. I fail to see how this can be a structural repair on a head this size!
Possibly better is to plug the hole, drill out a larger hole say 1" and plug THAT, then rebore the shaft hole in the new wood. The conical bushing is a variant of this and I think nicer.
But I'm not sure yet that's what's needed here.
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