Most new Black & Decker tools come with warranties for up to two years from purchase date. But if you really want to get your money's worth, simply take good care of your equipment and re-sharpen as necessary. Black & Decker hedge trimmers can last for decades if properly maintained. Sharpening the blades yourself is much more affordable than buying new blades or a new trimmer.
How to Sharpen your Exposed Blades
Unplug the trimmer before adjusting the motor or going near the blades. It is also a good idea to wear gloves and protective eyewear while sharpening your hedge trimmer.
Place your hedge trimmer in a vise. If you do not have a vise, you can ask someone to hold it for you while you work on it.
Use a ¼-inch to ½-inch wheel on a die grinder or Dremel rotary tool (such as the RTX-1) and run along the edges of each exposed blade.
Spray with WD40 to add shine and strength to your blades. Or dip in a bucket of hot, soapy water to remove sap from your blades.
How to Sharpen if your Blades are not Exposed
Poke a screwdriver through the ventilation slots to rotate the motor fan.
Rotate the motor manually with the screwdriver until your blades are exposed.
Repeat Steps 1 and 2 to expose the rest of the blades. Lightly grind the edge of each blade with your grinding wheel to get an even sharpness.