If you don't know what you are doing you are likely to ruin more brass than you improve. It has to be heated to only 350 C (and water quenched) the only way to gauge that is with a heat sensitive crayon. Any higher and it is stuffed too soft to be of any use. There are guys with AMP machines who will do this for you. I use Nik in Wellington who advertises on Trademe very professional.
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