Have done it by hand over the years but eyesight is not holding up, so today I unpacked enough to find my handy-dandy bit sharpening set up. Its cast aluminum, swivels on an adjustable stem base to arch the clamped bit to a grind stone. Primitive but works. I want to create a dedicated set up that will last the rest of my life, do you think a sewing machine motor would be heavy enough to keep a small stone rotating? The biggest load that would ever by on it is half of a 1 inch bit's cutting face. The standard size of sewing machine motors shaft is 1/4 inch, does anyone make a stone with such a small hole?