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A110_Renault posted on r/metalworking1w
Motor brushes are a wear item and easily replaced in most motors. You can get them for less than a dollar at a decent hardware store. Or get a kit of common sizes to have on hand: https://www.walmart.com/ip/40PCS-Electric-Motor-Carbon-Brush-Replacement-Set-10-Size-Maintenance-Brushes-Set-for-Electric-Tools/19274573355