Thanks- I wonder about the depth gauges- The Husqvarna guide doesn't seem to really let the gauge extend through the opening, and so it doesn't expose any material to file off. There is a small notch in the opening that doesn't seem to let the gauge extend through. I bought the Husqvarna sharpening guide- there is no size mark on the file- how do I know if it's 3/16 or 7/32?