4 One way to tell your blades need sharpening is by looking at the cut ends of the blades of grass. Read more to see how you can do it yourself quickly and cheaply. DIY – Sharpening Mower BladesJuly 31, 2018 in MISCELLANEOUS / TOOLS OF THE TRADE! tagged Drill Press / Mower Blade Balancer / Mower Blade Sharpener / Power Drill / Sharpen Blades by Paul