Rh, I am pretty sure the recommendation is not smith work beyond cutting the threads. Unless something needs, or is desired to be timed, or see below, to verify alignment.

Good threads cut 9/16-24.
Done
An adapter like this, with Rockset (or another high temp thread lock).
https://www.brownells.com/rifle-par...adapter-9-16-24-to-5-8-24-prod86836.aspx
Done
Verify alignment with bore. (Your smith could surely do this and trim the shoulder of the adapter if wanted or needed....)
Done
Good to go.

Anyone claim that ain't no good? Please explain.

Same company as linked above but may be a different size.
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