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They will work fine for cleaning up threads, but the chances of getting threads straight enough to be useful from scratch, are somewhat slim. Best to use a lathe to cut the threads.
Most industrial suppliers can order you one. It's generally not a stock item. I went online to look for a new one, and there was a tap and die place in Ottawa that had them listed. I paid about $50 for the last one (tap only) Brownells did have them listed, but when I was looking I couldn't find one.