Over time, the blades on your lawnmower will become dull and will need to be replaced or sharpened. However, if you don't know how to do it properly, you may end up damaging the blades or injuring yourself. To avoid these potential problems, it's important to learn how to tighten lawn mower blades. The first step is to remove the blade from the mower deck. Once the blade is removed, you'll need to use a file or sharpening stone to sharpen the edges. Be sure to follow the manufacturer's instructions carefully so that you don't damage the blades. Once the blades are sharpened, you can reinstall them on the mower deck and start mowing your lawn again. With a little bit of effort, you can keep your lawn mower blades in good condition for years to come.