Over the years I have used every method to sharpen blades. I have a push mower, 2 snapper riders, a zero turn grasshopper and a bush hog. Each one had two extra sets of blades. So that's 15 blades that need sharpening. This is just for my own use. I hate dull blades.
Every method I used was a pain in the butt! So I decided on this Bradley grinder. Since every mower I have has a different blade size, this grinder adjusts to any angle you want to put on the blade and it's reversible. The RPM's are half the speed of a normal grinder so the blade doesn't heat up much. The regular price was about $379. I got it on ebay for $175 brand new in the box last month. Of course, first thing I did was to sharpen every blade I have. No ratty, jagity looking hand done blade edge. It looks like it came from the factory.
By the way, I don't work for the company. I'm in Louisiana USA and the company is in Illinois. Made in USA too!
They still have them I ebay I see. Sold 19 and have 10 left. There price now is $195. It was when I bought mine too. BUT I offered $175 and it was accepted.
Here it is:
Bradley Lawn Mower Blade Sharpener | eBay