As a professional woodworker, I'd much rather use my tools than sharpen them, but I know dull or broken bits are unavoidable. I've had a toolbox filled with old drill bits, so it was past time to ...

If you don't have such a gage, you can cable-tie two large hex nuts together to give ... before you do any precision work on it, like sharpening a drill bit. This is one reason jigs and sharpeners ...