These are the parts that make up that assembly.
311538 - carbon brush holder
311539 - carbon brush spring
311540 - carbon brush cover
311542 - carbon brush
Your carbon brush cover is likely still fine (it's the copper bit you see there), but everything else will need to be replaced. The brush holder can be found at the link below, which is great since it's the only part you would have a hard time making. I have no source for the spring or the little brush, but those can be fabricated without too much trouble. The parts assemble as shown in this drawing.

311538 - carbon brush holder
311539 - carbon brush spring
311540 - carbon brush cover
311542 - carbon brush
Your carbon brush cover is likely still fine (it's the copper bit you see there), but everything else will need to be replaced. The brush holder can be found at the link below, which is great since it's the only part you would have a hard time making. I have no source for the spring or the little brush, but those can be fabricated without too much trouble. The parts assemble as shown in this drawing.
