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What you need:
  • Adjustable wrench
  • Wood block
  • Medium mill bastard file
  • Vise
  • Rag
  • Light machine oil
Always start by disconnecting the spark plug wire. This prevents the motor from accidentally starting. Granted, it's a long shot, but "better safe than sorry."
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To remove the bolt that holds the blade in place, wedge a piece of wood between the blade and the undercarriage of the mower to keep it from turning. Make note of which direction the blade turns. If you replace it backwards, it won't cut!
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Mount the blade on your work table with a vise or clamp. Use a file to sharpen the blade. Stroke the file across the blade in one direction, keeping it at a 45-degree angle to the blade.
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Mower blades must be balanced to work properly. Place the bolt that holds the blade in place in a vise with the threaded portion facing up. Place the blade on the bolt and spin it. This will indicate if the blade is balanced. If it wobbles, remove additional material from the heavy end.
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The last step is to wipe the blade with oil. Use a rag to wipe off excess, leaving a thin coat of oil on the blade. Replace the blade and you're ready to mow.