Some weeks ago I bought some abused brushed motors (Corally and Orion). Their conditions were awful with many rubber debris (motor were used by a touring racer), many soldering leavings and many soldering "scars".
I've opened every motor, cleaned and examining every single part I saved the saveable. Result: 3 complete motors from total of 7 purchased.
Received the needed spares from Team Corally in the Netherlands I reinterpreted (windings were too low) the old and tired touring motors in this 3 motors that will be useful for my classic cars :)