Just want to get some advice here. I have my blades sharpen by an lawnshop I get a good deal for a set of three, the guy charges me 1 dollar per blade. I was thinking about buying a balde sharpener and do them myself. What do you all think? I usually spend 21 dollars per week total of seven sets. What is a good brand of blade sharpener or should I just use a 4" grinding wheel. I like using this guy cause he does good and fast work. Thanks in advance. My old man use a rasp or file and a nail in the wall and he use to get a nice sharp balance blade.