The teeth on the saw from the factory are angled just about evenly in both directions. We want to increase the angle for the "pull stroke" - (below)

Using a 3 cornered jewelers file, cut the teeth as show for an agressive cut.

Hone the flat face of the blade on a stone. Then angle the saw as shown and grind an angle on the outside of the blade teeth. Concentrate on the center of the stone and apply pressure here while rocking the blade as shown in the animation. See the results below... Your saw will cut like a Laser beam after it is sharpened properly !!!