Just need a little reminder on how too please. I'm back doing extensive lab work and trying to get a edger up and running. The wheels need dressing badly as it seems that machine hasn't been trued in a long time. When checking the settings there are over 4500 jobs ran on the wheels. Now I have three (3) colored stones and the manual is not helpful at all in explaining. Can someone assist? I have a green stone, white stone, a brown stone and a grey stone. Now I'm confused. Any help would be greatly appreciated. Just trying to figure out which stone goes for what wheel. TIA