Woodie, It is a pretty simple repair. You buy a brush set. You DO need to ID the starter. Best is with the number on the housing. Like 25022, or 25079, or 25149. They, and other numbers, all interchange as assemblies, but the brushes are specific to 2 different styles. The earlier starters had that cover band, and the brushes ran on the diameter of the commutator. The later had triangular brushes that ran against the end of the commutator.
Of course, a well rebuilt starter will have a warranty. Brushes will be maybe 10 bucks. Peter