Instead of getting my old blade sharpened, I just bought the MB-850 and replaced the old one. It only cost $17 shipped to my house, so it really wasn't cost effective to drive somewhere and pay to have the old blade sharpened. Now, my Black & Decker MM-875 runs like new. One other note though, make sure you buy the right blade for your mower. Some models use different blades. For example, the Black & Decker MM-875 comes in Type 1, Type 2, and Type 3. This blade fits only Types 1 & 2.