To keep your chainsaw in good working condition it should be sharpened regularly and a Dremel rotary tool act as an excellent sharpener. To demonstrate this we'll be using a Dremel 10.8 Volt Lithium Ion tool, the chainsaw sharpening attachment, and a #543 sharpening stone. Be sure to check your chainsaw manufacturers guide for which size stone to use. A Dremel 400 series XPR, 300, 200, or 100 series tool can be used as well. After you're sharpening stone and attachment are in place sharpen all the teeth in one direction with the saw in the same place. Always try to take the same number of passes on each tooth.