I'm leaning towards trying a rethread of 20TPI over the 28TPI threads first. If it works out and I can get the final product to line up properly then it'll be great.
If that fails I will turn down the threads and weld on a 20TPI sleeve which will allow me to ensure the sights are vertical.
If both of those fail somehow I will go with a new blank.
Wish me luck.
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