We once had a little spipnner-making operation --- up to 24,000 or so one year. We found the absolute best way to quickly sharpen trebles. Buy a flat stone wider than the treble and lay the hook on it with two points touching at an angle, points toward you. Sharpen by pushing the hook away from you, and away from the hook points, in short choppy strokes, about 6 strokes. Rotate the hook, repeat at the same angle for the next set of points, then repeat a third time after rotating again. Then go around to each set of the three 2-point positions and very lightly stroke a couple of times. The result is a hook so sharp it is scary. Each hook has a perfect 60 degree bevel on each point. Total time --- about 20 seconds, even faster if you do the process while holding the hook and stone vertically in your hands and chop with the stone.