As each hole was drilled, I tapped it using a 10-32 tap. I made the taper
have a light fit with the draw bolt removed, and turned the drill chuck by
hand. As the tap drew itself into the faceplate, it could wobble a little
bit, but it stayed more or less square. The faceplate is fairly thin and
of a soft material, so this could have been done fairly easily by hand as
well.
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