If you're using mild steel and brazing it, I've heard from @Hulsroy that you don't need to be that accurate.
Wow. I was not talking about handlrbars
Yeah, what you can get away with on a rack is less than on bars, but I don't think you can realistically achieve "non-air-gap" accuracy with hand tools full stop.
@Hulsroy started
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If you're using mild steel and brazing it, I've heard from @Hulsroy that you don't need to be that accurate.