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.
Several buyers suggest coming up with a mowing pattern that moves away from the outlet and thus makes it harder for you to trip over the cord. One buyer found that the motor would get dirty during use and recommended opening it up and cleaning it with compressed air. When you first lay eyes on the Sun Joe MJ401E Mow Joe 14-inch 12 Amp Electric Lawn Mower you may be struck by how small it is. At 29 pounds it weighs almost half as much as the next lightest mower on our list. This makes it easy to maneuver but it does raise questions of durability.
To clean it first start with a cool engine. If your mower has a fuel valve switch it off. If you can disconnect the spark plug too. Next use a leaf blower to blast away any old dirt and major debris. Now gently lay the mower on its side fuel cap facing up. Try to get rid of any junk on the mowers underside as well.