An angle grinder??? Most professionals you a proper rotary blafe grinder.
pleasant
March 2010
Yes you need to remove it, clamp it in a vice and useing an angle grinder, re form the blades edge,approx 45 degrees, the grass side of the blade should be flat, do remember when you have finished you will need to re balance the blade by removing some more material from the heavier side of the blade.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lawn mowers.