I bought an expensive one because sometimes cheap Chinese ones don't work. Lo and behold, the Drill America brand has a Chinese stamp on it. Maybe a cheaper option would be just as good. Haven't used it yet because I'm not sure I'll keep it to myself, but I've tried hand-threading it onto a sample screw of the same thread and pitch to make sure it fits and doesn't hand-thread - tight despite adjustment. it as wide as possible.
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