Once you have finished cleaning and sharpening the blades, if needed, you can reassemble the mower. Reattach the blades making sure you tighten them well and thoroughly. Once the blades are set and tight, sit the lawn mower upright.
Next, lubricate the blades. Simply spray WD-40 Multi Use Product over the mower blades to keep them free from rust and corrosion. This will help to prolong the life of the blades and your mower.
Finally, once you are done with lubricating the blades and housing of the lawn mower, you can reattach the plug wire into the spark plug.