Here's start to finish instructions on how to sharpen your own lawnmower blade. Save money and do it yourself! Learn to sharpen it yourself and never take it for service again!

Here's That Video From "FireBall Tool" where he proves it's ok to drag a file backwards:
   • I Filed Backwards 2500 Times, And Thi...  

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Coconuts by MBB   / mbbofficial  
Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0
Free Download / Stream: http://bit.ly/2vear96
Music promoted by Audio Library    • Coconuts – MBB (No Copyright Music)