Bought a used lesco/neary 440 blade grinder a little bit ago and still trying to figure out the best way to sharpen! I read these ads for multi-matic? blade sharpener that does it in 60 seconds, is this true? I keep running the blade back and forth across the wheel at the right angle but how much pressure should I apply against the grinding wheel? And when I pull the blade back across the wheel, the aluminum angle rest isnt long enough to support the length of the blade and I have to eyeball it the best I can for the end of the blade. Sometimes the blade isnt straight and has curves in it too. Itll sharpen the outside edges but not hte inside parts of the curves. Is it ok to use the edges of the wheel, running the blade diagonally on the aluminum rest? Any and all advice is appreciated.