Step 8: Check that the blade is balanced.
From time to time, stop sharpening and check the balance of the blade. A small piece of angle iron can serve as a fulcrum. The weight of each arm of the blade must remain the same because an out-of-balance blade, spinning at high speeds, can cause severe vibration that will damage your mower. If one side is a little heavy, grind a little more metal off the entire length of the heavy side. When you are sharpening, be careful not to overheat the blade. If the blade starts to get hot, dip it in a pail of water. Overheating the blade ruins the temper or hardness of the blade, which is dangerous because the blade becomes brittle and can break.
 Use a piece of angle iron to make sure the blade is balanced.
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