Sharpen a Mower Blade Sharpen a Mower Blade
1. First remove the spark plug and then the blade from the mower.
2. Place removed blade into a vise. Grind the blade parallel to the original angle, removing as little metal as possible with the grinding stone.
3. Clean dirt and debris from the blade. A balanced blade will stay level when checked with a screwdriver inserted through the center hole.
4. To restore blade balance, remove some metal from the end of the blade. Do not grind more on the cutting edge.
Courtesy of Dremel Tools