Follow the contour

Follow the contour- they mean the contour of the axes blade?

What if follow in "follow the contour"?

You can actually sharpen lawnmower blades, while they're still on the machine. Just like so. You don't need one of our guides because the belts just gonna conform to the shape, that's already there, and then you can also do your axes, the same way, no need for a guide. Just let the belt follow the contour.