Here's how to sharpen lawn mower blades yourself. In this article: Dual-Purpose Clamp-On Universal Vise, Smith's 50603 Lawn Mower Blade Shop Essentials and Sharpal 103N All-in-One Garden Tool ...

A blunt blade will put stress on your mower’s engine. If you follow our guide, you'll only need two tools to sharpen your blade. Just make sure to wear heavy gloves and consider eye protection ...

that brand’s Lawn Mower & Garden Tool Sharpener attachment (Amazon, Home Depot) can help in sharpening the blade. Put the blade assembly back together, following the picture you snapped earlier.