I spent a day and a half going to rewind shops in Alberta looking for brushes. No one had ever seen the brushes I needed, and did not think they could get them.
The little DC motors are pretty sturdy, usually just need bearings and brushes. Maybe a brush spring.
I finally found a shop that could do them in Missouri or something. Well, I sent my cores and he sent reman motors. I think he had a good profit margin going as the reman motors were pretty shoddy.