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As you've discovered, that's not a standard tap. There are companies out there that will grind you a custom, but that costs $$$$$$$$$$$$$$$$. I have a friend in the mill supply business who has saved me thousands by finding non-standard cutting tools for projects just like this. I'll drop him an e-mail. He usually can give me a yea or nay in a couple days, and I'll pass it along.
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