Smooth auger blades aren’t designed to cut through packed or icy snow so the snow may be harder to clear if your snowthrower has this type of blade. Snowthrowers with serrated auger blades cut easily into icy snow. Track drive also helps the machine grip the surface and push into the icy snow.
When drilling blind holes in iron or steel, fine metal bits usually fall into the hole. To remove them, you can use a strong magnet and a soft iron or steel rod that is smaller in diameter than the hole. Push the rod to the hole bottom, then press the magnet to its upper end. Keeping the magnet to the rod, pull it out of the hole and brush away the bits of metal. Repeat until all of the metal bits are removed.