To sharpen them secure in a table vise. Now attach the blade sharpener to the end of your power drill. Make sure to wear eye protection and work gloves. Carefully use the sharpener to hone the cutting edges of your blades. Go slowly at first to get the feel of the best angle for meeting the blade and sharpener.
The Greenworks 20-inch 12 Amp Corded Lawn Mower has a lot of features that can make your mowing experience enjoyable. Since it is corded you dont need to stop to recharge a battery or gas up. It is a three-in-one that has mulching side discharge and rear bagging capabilities. There are seven cutting height positions ranging from 1.5 to 3.75 inches and you can adjust the height with a single lever. Plus the 10-inch rear wheels 7-inch front wheels and 56-pound size make it easy to push around the yard.
After sharpening both sides of the blade place it on the kits cone-shaped balancer. If one side dips below the other continue sharpening it until the blade rests level. Return the sharpened blades to the mower and reattach. If you have a torque wrench its a good idea to use it here. Often you need to tighten the blade mounting bolt/bolts to a specific tightness level. Typically measured in pound-feet your instruction manual should list these specs. For example my personal machine the Honda HRR216VKA between 36 to 43 lb-ft of torque is required.