All I use. 80 grit sanding wheels that go over the rubber drum bits, and buy a few packs of them at a time. Each wheel lasts maybe a half dozen sandings. If I end up doing nails every other week instead of weekly, I can buzz off the long bit of the nail in one 2-3 second press. Once I get close to the quick, I use short taps to shape the nail and hit the outer edge of the quick to push it back. Keeps the heat down to prevent pain. Chipped/frayed edges on nails have gone down significantly since I can ease those off with the sander so nothing gets caught when they run. I love the ability to shape the nail as well. If it gets a bit thick on the top I round that off so there isn't a big flat spot with an angle when the foot rolls over the nail.