Don't want to hijack the thread but I cut down a stump, and I know it had sand in it. But anyhow I knocked the chain off and it hit that metal guard and stopped. It's a Husky 455. I have the two file Husky sharpener and I sharpened it twice and it still only shoots small chips. There doesn't seem to be any damage. I am very careful with the angle I sharpen at. The saw is very new, so the bar and chain are also. Not sure what my problem is.