My grinder refused to work, disconnecting the grinder and with a controller plugged into the outlet, the diagnosis came out quickly. By turning the disk contact appeared intermittently. At the opening of the grinder: lots of dust and the used carbon brushes. The price of 4 stores was 15 to 25, and much less at the walk, even with the port. After cleaning the grinder, replacing coal, reassembling and testing all conclude my grinder is in operation again. Good buy for a quality / price ratio, I do not regret my purchase.
